Evolution of Lifeforms

Which best explains the relationship between evolution and natural selection?

• Evolution causes natural selection.

• Natural selection is one aspect of evolution.

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Over time, the length of giraffes’ necks changed slightly to allow them to reach taller trees. How should this change be classified?

• adaptation

• acquired trait

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Which represents an adaptation?

• a bird with a curved wing that allows it to fly faster

• a dog that learns to bark when someone knocks on the door

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Which will most likely prevent a species from becoming extinct?

• absence of a predator species

• genetic variability within the species

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A brown rabbit is easily hunted and killed in an arctic ecosystem. Which would be expected to appear most often in future generations born in the same ecosystem?

• white rabbits

• brown rabbits

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Which would most likely cause an entire species to become extinct?

• competition for food

• limited genetic variation

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An arctic hare experiences a genetic variation that keeps its coat from changing to white for the winter season. Which element in the environment would pose the greatest threat because of this variation?

• predators

• pollution

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Which bird’s beak is best adapted to get nourishment from the nectar of flowers?

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Four species of Galapagos finches are shown above. Which best explains why the birds evolved with differently shaped beaks?

• They adapted to eating different types of food.

• All of the birds ate the same type of food.

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Bird wings and butterfly wings are an example of

• Homologous structure
• Analogous structure

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