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3 years ago

What are the 3 steps of Natural Selection?

1 answer:

5 0

There Are Actually 5 Steps.
Step 1: Produce More Offspring Than Can Survive
Step 2: variations occur in a species
Step 3: competition for limited resources
Step 4: better adapted organisms are more likely to survive and reproduce
Step 5: change in a population will most likely occur

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In addition to water and carbon dioxide, photosynthesis requires

user100 [1]

Photosynthesis is used by plants for energy. In addition to carbon dioxide and water, light and chlorophyll are required for photosynthesis to work.

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3 years ago

How do some cold-blooded animals keep their bodies at a constant temperature in cooler environments? By generating their own hea

nekit [7.7K]

I am thinking it is by heating themselves in sunlight. I think this because when I bring lizards to mind, they are cold blooded, and they need sunlight to bath in so they do not start to lack warmth to live.

I hope this helps.

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3 years ago

Read 2 more answers

What is the pH if 20 mL of pH = 2 solution is diluted to a final volume of 600 mL?

Mashutka [201]

Explanation:

Hydrogen atoms contain 1 proton and 1 electron while being devoid of neutrons. When they lose their electron they form an ion or H+, a particle carrying a unit of positive charge. pH measures how basic or acidic a water-based solutions are, with a formula for pH is

pH = -log[H+].

...where pH is -base 10 log of the concentration of hydrogen ions within the solution.

Initial volume= 20 mL

Final volume= 600 mL

# of dilutions= $\frac{600}{20}$ = 30

for a pH 2= [H+]= $10^{=2}$

∴ [H+]= $\frac{10^{-2}}{30} = 3.333 * 10^{-4}$

and pH is an antilog of [H+]= - log $\frac{10^{-2}}{30} = 3.333 * 10^{-4}$

∴pH = 3.47

Learn more about pH at brainly.com/question/4981491

Learn more about pKA at brainly.com/question/11062486

#LearnWithBrainly

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3 years ago

Explain Mendel's law of independent assortment and how the 9:3:3:1 phenotypic ratio among the F2 of a dihybrid cross provides ev

GrogVix [38]

Answer:

Explanation:

Mendel's law of independent assortment state that two different genes assort independently in gamete formation.

To reach this conclusion, one has to do a dihybrid cross. This means that two genes responsible for different traits need to be analyzed at the same time.

1) Starting with a parental generation of a cross between two pure lines (homozygous for both genes) with different traits, a plant with yellow and round seeds (YYRR) and another with green and wrinkled seeds (yyrr). The F1 will be phenotypically homogeneous (yellow and round), and genotypically heterozygous (YyRr).

2) If the individuals from the F1 are crossed with one another, we have to do a Punnett Square to determine the phenotypic ratio of the F2.

If the genes assort independently, the F1 individuals will produce their different gametes with the same probability. Each possible gamete will appear in a 1/4 proportion: YR, Yr, yR, yr.
The 9:3:3:1 ratio is a result of analyzing the possible phenotypes that result from the dihybrid cross.

See the attached image for an illustration of the crosses in each generation and the Punnett Square.

4 0

3 years ago

Why do you think UV intensity changes with latitude?

Furkat [3]

Answer:

Because of the angle of the Earth relative to the sun. The higher the sun is in the sky, the higher the UV radiation level.

Explanation:

So, the lattitudes toward the poles that receive sunlight are at an oblique angle, with that being said, the amount of radiation is spread to a larger area than the equator.

6 0

3 years ago