Evolution, Extinction, and Ecological Succession Flashcard

Front

What is a mass extinction?

Back

When multiple species from all over the earth suddenly go extinct.

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What is natural selection?

Back

Survival of the fittest.

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What is the most important function of pioneer species?

Back

To create soil and add nutrients to the environment.

Front

True or False: Human beings are wiping out species much faster than nature creates them, causing what scientists call a '6th extinction'.

Back

True.

Front

What does 'change over time' refer to in biological terms?

Back

Evolution.

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What is ecological succession?

Back

The process by which ecosystems change and develop over time.

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Define extinction.

Back

The end of an organism or a group of organisms, resulting in no living members.

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What is a keystone species?

Back

A species that has a disproportionately large effect on its environment relative to its abundance.

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What is the role of decomposers in an ecosystem?

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To break down dead organic material and recycle nutrients back into the ecosystem.

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What is genetic variation?

Back

Differences in DNA among individuals within a population.