Answer:
Dark matter provides the gravity that allows the stars to rotate at the same speed.
Explanation:
The stars at the edges of a galaxy are rotating around the galaxy’s center at the same speed as the stars in the middle of the galaxy. How does this provide evidence of dark matter?
Dark matter absorbs light from outside the galaxy, allowing the light of the stars in the galaxy to show the orbital speeds of the stars.
Dark matter emits the light that astronomers need to see the orbital speeds of the stars.
Dark matter subtracts gravity, which allows the stars to rotate at the same speed.
Dark matter provides the gravity that allows the stars to rotate at the same speed.
Please don't use these answers to cheat they are for help.
The statement shows that D. Dark matter provides the gravity that allows the stars to rotate at the same speed.
According to the information given in the question, it should be noted that the stars at the edges of a galaxy are rotating around the galaxy’s center at the same speed as the stars that are in the middle of the galaxy.
This implies that dark matter provides the gravity that allows the stars to rotate at the same speed. It should be noted that dark matter doesn't emit the light that astronomers need to see the orbital speeds of the stars.
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Question #14: In which scenario below would natural selection be most successful?
A.) All insects in a certain desert that have the same adaptation for saving water
B.) An island with lizards that all look alike and are all eating the same food
C.) A population of parakeets that have the same size beak
D.) A population of salmon with different skin colors that attract mates.
Answer:
the answer is d
........
Answer:
D) a population of salmon with different skin colors that attract mates
In which ways might ocean currents be like streams and rivers on land
Answer:
Ocean currents act much like a conveyor belt, transporting warm water and precipitation from the equator toward the poles and cold water from the poles back to the tropics. Thus, ocean currents regulate global climate, helping to counteract the uneven distribution of solar radiation reaching Earth's surface.
Ocean currents in different ways might be like streams and rivers on land they sweep along the predictable paths. Ocean currents flow at the surface, and flow deep within the waterbodies.
What are Ocean currents?Ocean currents act much like similar to a conveyer belt. Ocean currents transport warm water and precipitation of water from the equator towards the poles and cold water from the poles back to the tropics of the globe. Thus, the currents which regulate global climate, helping to counteract the uneven distribution of solar radiations reaching to the Earth's surface.
Ocean currents flow like that of vast rivers, sweeping along with the predictable paths. Some of the ocean currents flow at the surface and others flow deep within the water. Some ocean currents flow for very short distances, however others cross entire ocean basins and even circle the globe.
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Give an example of a negative effect of selective breeding.
Answer:
Explanation:
Disadvantages include a reduction in genetic diversity and discomfort for animals that have very exaggerated characteristics.
Answer:
Many domestic animals and plants are the result of centuries of selective breeding. Disadvantages include a reduction in genetic diversity and discomfort for animals that have very exaggerated characteristics.
Explanation:
what would happen if you gave your dog a tiny piece of chocolate?
Some male peakcocks used to have bright and large tails while others had dull, smaller tails. Female peacocks will only mate with the ones that have the brightest and largest tails. Explain how this would impact the offspring of male peacocks over time.
Answer:
Over time, most males will have bright and large tails. Females only mate with males carrying these traits, and so natural selection will favor them.
Explanation:
Bright and large tails are traits that reflect the genetic quality of males. So individuals with the most vibrant color and length express better capabilities of finding food, competing for resources, competing for males, among others, are the best option to mate and to ensure successful offspring.
The brightest and largest tails are, the better chances males have to mate and pass their genes to the following generations. So the organism spends energy and resources to produce more vibrant colors and longer feathers to enhance mating chances.
Females must ensure their reproductive success, so sexual selection is the pressure modeling males in this species. Females will only choose individuals with the better genetic charge to mate -individuals with brightest and largest tails-, so their progeny can have better genes and higher survival probabilities.
Males with the brightest and largest tails will mate and reproduce. They will pass their genes to their progeny. Male offspring will also have bright and large tails because they inherit these conditions from their parental. These male offspring will also pass their genes to the progeny, and so on. The frequency of the alleles that express these traits will increase in the population. Natural selection is favoring these alleles. So over time, there will be much more individuals with bright and large tails than individuals with dull and small tails.
Which of the following provides the foundation for life on earth?
solar energy
nuclear energy
natural resources
renewable resources
Answer:
The correct answer would be - solar energy.
Explanation:
Solar energy or the light energy that comes from the sun is one of the major sources of energy for all living forms directly or indirectly. There would be no life without solar energy on earth.
Solar energy is responsible for the food and energy of each and every living organism. Plants produce their food with the help of sunlight or solar energy and the rest of the other organisms depend on this food for their food and energy.
Las margaritas se cierran durante la noche y se abren al amanecer. Durante los inviernos fríos, algunos animales hibernan, a la espera de las estaciones mas cálidas, cuando abunda el alimento. Cuando sentimos frio se nos pone “la piel de gallina” y tiritamos, en cambio si hace calor, nos da sed y bebemos agua ¿Qué tienen en común estas situaciones?
Nicole made the model shown below to represent the steps in the formation of a thunderstorm.
The diagram has six boxes. The first box on the top left has the symbol '?' in it, an arrow points from it, over to the left to a box with the text 'Meets coool air'; this box has an arrow pointing down from it to a box with the text 'Condenses'; this box has an arrow pointing to the left to a box with the text 'Clouds formed'; this box has an arrow pointing to the left to a box with the text 'Clouds grow bigger'; and this box has an arrow pointing down from it to a box with the text 'Precipitation'.
© 2010 FLVS
Which of these best fits the empty cell in Nicole's model?
warm, moist air rises
warm, dry air descends
water vapor condenses in clouds
water vapor evaporates from ocean
Answer:
The correct answer is - warms, moist air rises.
Explanation:
When moist warm air rises and meets with the surface of cool air the more dense air that is cold air end up below the warm moist air in the troposphere it condenses as it rises.
The condensation of the warm, moist water leads to the formation of cloud formation. This cloud gets bigger and bigger until it precipitates and rain fall occurs.
Answer:b
Explanation:took the test
The type of energy in starch molecules
Answer:
A chain of six is shown below.) Both plant and animal cells store the energy of glucose in these starch molecules for later use. Starch molecules may be found in chloroplasts. If a plant cell has a lot of extra starch molecules, then the starch gets stored in a separate structure known as a leucoplast.
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The series of membrane-bound channels between the nuclear and
cell membranes, serving as a cellular transport system is the
o plasma membrane
O nucleus
o endoplasmic reticulum
Answer:
C. Endoplasmic Reticulum.
Explanation:
The Endoplasmic Reticulum also includes ribosomes attached to the membrane and can produce protein.
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an adaptation is
A - how an organism evolves during its own lifetime
B - any trait an organism possesses
C - a gene an organism has
D - a trait that helps an organism survive in its environment
A(n) is the general term for an infectious disease that has spread across a city, region, or country.
Answer:
epidemic
Explanation:
The situation in which a disease spreads over large area or effects a large population of people, the term used to denote is known as epidemic. The disease is caused for a short period of time. The disease is spread rapidly and the outbreak creates a havoc in the region. A particular country or area is infected by the epidemic. Pandemic refers to the spread of disease over many countries and continents. Epidemic when spreads to more countries it is termed as pandemic.
Answer:
Epidemic
Explanation:
List the possible phenotypes for rat eye color.
Elements such as The lungs exchange gas to maintain homeostasis. In the alveoli of the lungs, oxygen and carbon dioxide are exchanged. This exchange occurs between the lungs and blood vessels (capillaries). The transport of oxygen to the blood does not require energy. The membranes of the alveoli are thin and moist and allow gasses to dissolve and be transported to and from the blood. When we breathe, a high concentration of oxygen enters the lungs and moves to the blood. Based on this scenario, is the transport of oxygen a result of osmosis, diffusion, or active transport?
Answer:
oxygen are among the few simple molecules that can cross the cell membrane by diffusion. And Diffusion is one principle method of movement of substances within cells, as well as the method for essential small molecules to cross the cell membrane. The oxygen molecules move, by diffusion, out of the capillaries and into the body cells. While oxygen moves from the capillaries and into body cells, carbon dioxide moves from the cells into the capillaries.
Explanation:
Answer:
This is Diffusion........... :)
What is the purpose of rRNA?
A. to retrieve amino acids
B. to be a working copy of DNA
C. to assemble proteins
D. to replicate the genetic code in mitosis
Answer:
A
Explanation:
The primary function of rRNA is in protein synthesis – in binding to messenger RNA and transfer RNA to ensure that the codon sequence of the mRNA is translated accurately into amino acid sequence in proteins.
what triggers angry in the brain?
Answer:
amygdala
Explanation:
Answer:
Anger starts with the amygdala stimulating the hypothalamus, much like in the fear response. In addition, parts of the prefrontal cortex may also play a role in anger. People with damage to this area often have trouble controlling their emotions, especially anger and aggression. Epinephrine or adrenalin released by medulla of the adrenal glands, surges at the time of panic and emergency. It provokes stress response and brings out the arousal of extreme emotions like fear, anger or amusement.
Explanation:
hope this helps! brainliest?
Summarize the 3 trends in human population
Answer:
Population trend refers to changes over time and can include changes in ranging behavior (e.g., distance and route) and distribution, biogeography (e.g., size of population) and life-history (e.g., birth and death rates).
Without the process of translation, our cells would not be able to:
make DNA
make RNA
make amino acids
make proteins
Answer:
Make protein
Explanation:
Make protein by RNA
A team of science researchers is trying to decide which type of microscope to purchase for their laboratory. Compared to electron microscopes, a light microscope provides which of these drawbacks or disadvantages?
A. uses electricity
B. specimens cannot be alive
C. lower magnification power
D. more expensive to purchase and operate
Answer:
d
Explanation:
The drawback or disadvantage associated with the use of light microscopes over electron microscope is its lower magnification power.
LIGHT MICROSCOPE:
Light microscope is a type of microscope in which photons of light is used to view specimens. The light microscope is distinct from the electron microscope being that electron microscope uses beam of electrons instead. One advantage of light microscope is that it can view specimens alive while electron microscope can only view dead specimens. However, one disadvantage associated with the use of light microscope is that it possesses a lower magnification compared to electron microscopes.Learn more at: https://brainly.com/question/4442916
correct answer gets brainiest. and i’m telling u. if u guess or leave a link, ur getting reported and that’s not a threat
Answer:
Blood circulation
Explanation:
I'm pretty sure. Thank you.
a black chicken and a white chicken are crossed. what is the probability of.
Answer:
25% that they would have a black chick
Explanation:
50% of the offspring have genotype BW, 25% are BB and 25% are WW. This means that 50% of the offspring are erminette, 25% are black, and 25% are white.
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Help me right now! I need the answer in an paragraph please and I will make you brainlest!
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Species X and species Y are living animal species that have many similar physical characteristics. These characteristics suggest the species are closely related.
Which of the following would be the best evidence that species X and species Y have a common ancestor?
A.
A fossil of a different species is found that has some of the characteristics shared by species X and species Y.
B.
A fossil of a different species is found that has none of the characteristics shared by species X and species Y.
C.
A third living species is found that has none of the characteristics shared by species X and species Y.
D.
A third living species is found that has some of the characteristics shared by species X and species Y.
D, not pretty sure. ㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤㅤ
which involves producers, consumers, and decomposers?
the water cycle
nitrogen fixation
evaporation
the carbon and oxygen cycles
There are millions of organisms on Earth that scientists have classified into different levels of organization. Which of these characteristics would be most important to scientists when classifying organisms?
a)where the organism lives
b)how small the organism is
c)the genes of the organism
d)the shape of the organism
Answer:
I think no. b is the ans or maybe not
There are millions of organisms on Earth that scientists have classified into different levels of organization. The characteristics which would be most important to scientists when classifying the organisms will be the genes of the organism. Thus, the correct option is B.
What are the different levels of organization?Taxonomy is the study of classification of organisms. Scientists have used many different types of information to place the different organisms into specific groups. The groups are arranged in different levels. These levels were named as kingdom, phylum, class, order, family, genus, and species.
The organisms which were present on the Earth were classified on the basis of the environment where they live, how small is the size of the organism, and the shape of the organism found such as rod-shape, cocci, spirillum, etc.
Therefore, the correct option is B.
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Offspring of certain fruit flies may have yellow or ebony bodies and normal wings or short wings. Genetic theory predicts that these traits will appear in the ratio 9:3:3:1 (9 yellow, normal: 3 yellow, short: 3 ebony, normal: 1 ebony, short). A researcher checks 100 randomly selected fruit flies and finds the distribution of the traits to be 59, 20, 11, and 10, respectively. Are the results this researcher observed consistent with the theoretical distribution predicted by the genetic model
Answer:
Yes, the observed results are consistent with the theoretical distribution predicted by the genetic model. The population is in equilibrium.
Explanation:
Available data:
Offspring of fruit flies may have yellow or ebony bodies and normal wings or short wings.Expected phenotypic ratio 9:3:3:19 yellow, normal: 3 yellow, short: 3 ebony, normal: 1 ebony, shortSample size , N = 100Phenotypic distribution 59:20:11:10To know if these results are consistent with the expected ones, we need to develop a chi-square analysis. To do it we need the following information
Chi square= ∑ ((Obs-Exp)²/Exp)- ∑ is the sum of the terms
- Obs are the Observed individuals
- Exp are the Expected individuals
Freedom degrees = K – 1- K =genotypes number = 4
Significance level, 5% = 0.05 Table value = Critical value
First, define the hypothesis:
Hypothesis: The allele of this population will assort independently. The population is in equilibrium
H₀= Individuals will be equally distributed.
H₁ = Individuals will not be equally distributed.
Second, we need to get the expected number of individuals with each phenotype. To do it, we will use the expected phenotypic ratio and the total number of individuals in the sample. We can just perform a three simple rule, as follows:
16 ------------------------------------ 100 individuals in the sample ------- 100%
9 yellow, normal ---------------- X = 56.25 individuals -------------------56.25%
3 yellow, short ------------------- X = 18.75 individuals --------------------18.75%
3 ebony, normal -----------------X = 18.75 individuals ---------------------18.75%
1 ebony, short ---------------------X = 6.25 individuals ----------------------6.25%
Now that we know the expected numbers of individuals with each genotype, we can compare them with the observed ones.
yellow, normal yellow, short ebony, normal ebony, short
Expected 56.25 18.75 18.75 6.25
Observed 59 20 11 10
The chi-square value = Σ(Obs-Exp)²/Exp.
So now we need to calculate (Obs-Exp)²/Exp
yellow, normal(Obs-Exp)²/Exp = (59-56.25)²/56.25 = 0.134
yellow, short(Obs-Exp)²/Exp = (20 - 18.75)²/18.75 = 0.083
ebony, normal(Obs-Exp)²/Exp = (11 - 18.75 )²/18.75 = 3.203
ebony, short(Obs-Exp)²/Exp = (10 - 6.25)²/6.25 = 2.25
X² = Σ(Obs-Exp)²/Exp = 0.134 + 0.083 + 3.203 + 2.25 = 5.67
X² = 5.67Significance level = 0.05Degrees of freedom = genotypes number - one = 4 - 1 = 3Critical value or table value = 9.348P₀.₀₅ > X2
9.348 > 5.67
There is not enough evidence to reject the null hypothesis. The genotypes might be in equilibrium, and there might be an independent assortment.
What is the main function of leaves?A. Leaves provide support for growth and a place to store food.B. Leaves provide a place for photosynthesis to occur.C. Leaves absorb water and minerals and transport nutrients to the stem.D. Leaves create a barrier that prevents water in the plant's tissues from evaporating
Answer:
B
Explanation:
The main function of a leaf is to produce food for the plant by photosynthesis.
Answer: The correct answer is B. Leaves provide a place for photosynthesis to occur.
Explanation: Confirmed correct.
Which process produces a greater number of offspring?
chromosome duplication
asexual reproduction
gamete formation
sexual reproduction
Answer:
asexual reproduction
Explanation:
Sexual reproduction produces a greater number of offspring compared to asexual reproduction, chromosome duplication and gamete formation.
What is the involvement in sexual reproduction ?This is because sexual reproduction involves the combination of genetic material from two parents, resulting in offspring that have a unique genetic makeup.
This increases the number of possible genetic combinations and thus the number of offspring produced. Chromosome duplication and gamete formation are involved in the process of sexual reproduction, but neither produces offspring by itself.
Chromosome duplication is the process by which one cell splits into two identical cells, each with the same genetic material. Gamete formation is the process by which reproductive cells such as sperm and eggs are formed.
These cells then combine during sexual reproduction to form a new organism. Asexual reproduction, on the other hand, involves a single organism producing offspring that are genetically identical to itself. This means that the number of offspring produced is limited compared to sexual reproduction.
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What type of microscope would you use to view a live sample?
1. Scanning Electron Microscope
2.Transmission Electron Microscope
3.Magnifying glass
4. Light Microscope
Answer:
Compound microscopes
Compound microscopes are light illuminated. The image seen with this type of microscope is two dimensional. This microscope is the most commonly used. You can view individual cells, even living ones.
What does the word "reliable" mean?
Answer:
the answer it can be depended on.