Evolutionary Relationships — Unit test

Question 1 • Biology_B_IC_Alt

Variations within a species are an important part of Charles Darwin's theory of evolution. Which example can be explained by individual variation?

Answer

The food source in a lake is not enough to support the bass population, but it can support the trout.

A population of brown bears has doubled in the past 10 years as its habitat size has increased.

Owls and foxes compete fiercely against each other for small rodents in their habitat.

Brightly colored cardinals are better able to survive and to reproduce than darker cardinals.

Explanation

Individual variation means that members of the same species differ in traits. The cardinals vary in brightness, and the brighter color is linked to better survival and reproduction, so this example shows how variation can affect which individuals leave more offspring. The other choices describe differences between species, population growth, or competition rather than variation among individuals of one species.

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