Sanders - Natural Selection Unit Review

The differences among a species, like different bird beaks, are called

• genes.
• variations.
• traits.
• theories.

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Mutations are a change in what?

• DNA

• tRNA

• protein

• rRNA

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All rabbits of the same species living in a particular area would be an example of a(n)

• ecosystem

• population

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Why do frogs and other organism reproduce so many eggs or offspring?

• so that their babies can have friends to play with
• the more offspring the more likely the offspring will survive
• the more offspring the less likely offspring will survive 
• the more offspring the less competition

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Why is competition important for natural selection?

• It shows which variations are more successful, allowing the organisms with those variations to survive.

• It causes organisms, regardless of which traits they have, to die out, reducing the population size.

• It causes organisms to get stronger due to having to outcompete other species.

• Competition is not important for natural selection.

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Adaptations can be:

• camouflage

• ability to survive cold weather

• hunting skills

• all of the above

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A species could go extinct if:

• food becomes more plentiful.

• members of the species have adaptations to enhance survival.

• the environment changes drastically and no one can adapt.

• there is less competition for resources.

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TRUE or FALSE: Natural selection will still occur if each individual has the same exact traits

• TRUE

• FALSE

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How do you "win" at natural selection?

• survive

• go extinct

• survive & reproduce

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Due to pollution, a pond becomes darker over time. Which trait variation became more common?

• light fish

• dark fish

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