Understanding Natural Selection

What is the definition of natural selection?

• Organisms that are best adapted to their environment are most likely to survive and reproduce

• Organisms have descended from ancient organisms

• Any difference between individuals of the same species

• A physical characteristic that helps an organism survive and reproduce in its environment.

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Which is NOT an example of natural selection?

• Some giraffes have long necks and others have short necks. If the low bushed died out, so would the giraffes with the short necks.

• Finches on the Galapagos Islands have different beaks. A bird with a long beak could get bugs from inside a tree, but if a finch with a shorter beak tried to eat those bugs, they would not survive.

• Iguanas change their color so they can survive/reproduce.

• Lizards with short legs cannot climb up rocks to get away with danger like lizards with longer legs could.

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What book did Darwin write?

• The Theory of Evolution

• Why Evolution is True

• The Voyage of the Beagle

• The Origin of Species

True OR False?

Variation: any difference between individuals of the same species.

• True

• False

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Select all that apply to environmental change.

• A change that affects individuals

• A change that affects a species

• A change that affects water

• A change that affects organisms with specific traits

• A change that affects cars and roads

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Where do variations come from?

• Genes

• Environmental change

• Natural selection

• Evolution

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What did Darwin observe about selection?

• Some variations make individuals better adapted to their environment

• Natural selection can lead to change

• Only organisms with a desired characteristic are bred

• A process similar to artificial selection might happen in nature

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