Natural Selection Evidence

What evidence exists for Darwin's theory?

• Fossil record

• Comparisons of similar anatomy between species

• DNA Evidence

• All 3 of these types of evidence

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Natural selection leads to

• populations becoming better adapted over many generations.

• individuals changing to adapt to environment.

• almost nothing going extinct.

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Mutations, gene flow and choosing a "fit" mate can all lead to

• new variations.

• nothing; they make no difference.

• extinction in all cases.

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Theories have

• little evidence and are tentative.

• have lots of evidence and are widely agreed on by many scientists.

• many scientists randomly guessing.

An inherited trait that helps a living thing survive in a specific environment is called a(n)

• Adaptation

• Competition

• Species

• Gene Flow

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What happens to new traits that HELP organisms survive over time?

• Nothing

• That trait becomes MORE COMMON in the population

• That trait becomes LESS COMMON in a population

• Equally common

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Images of the embryo and adult stages of three different organisms are shown. Which of the following is the best conclusion that can be drawn from this evidence?

• Having similar embryos indicates that these organisms eat the same types of food.

• Having similar embryos indicates that these organisms share a recent common ancestor.

• Having similar embryos indicates that these organisms live in a similar environment.

• Having similar embryos indicates that a certain protein controls how many legs the adult organisms will have.

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What most likely caused the finches on the Galapagos Islands to have beaks that were different from the finches on the mainland?

• There were different types of predators on the islands.

• The finches on the mainland could not fly high enough.

• There was no water on the islands.

• There were different food types on each island.

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If a new trait DOES NOT help an organism survive, what may happen to it?

• Not survive or reproduce

• Survive & reproduce

• Survive

• Die

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Which traits were selected for in whale ancestors?

• Traits that helped them walk on land

• Traits that helped them move in water

• Traits that helped them give birth

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