Chapter 7 Check for Understanding

What makes a species invasive?

• It enters a new habitat.

• It changes and adapts quickly to new environments.

• It outcompetes or displaces the native species and negatively impacts the ecosystem.

• It is at risk of suffering extinction.

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What is the background extinction rate?

• This is the extinction of an unknown species.

• This is the low rate of extinction that happens naturally.

• This is extinction that only occurs in less important biomes.

• This is extinction that no one notices occurring.

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Do you believe that zoos should have the goal of returning animals to the wild or should they keep them safe in captivity? You must explain your answer in two to three sentences. There is no right or wrong answer, so just give your honest and informed opinion.

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How can chemicals sprayed in one location end up harming organisms and ecosystems elsewhere?

• They teleport through gaps in space time within ecosystems.

• They can't because chemicals sprayed in one place would never end up in another.

• The chemical isn't moving it was always present in the other ecosystem as well.

• The chemical can move in water, air, or even within organisms it has accumulated in.

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How does a species become extinct?

• It becomes extinct when other species move into its habitat for the first time.

• It becomes extinct when other species in the area reproduce faster than this species can.

• It becomes extinct when it cannot adapt/successfully reproduce under new environmental conditions or a catastrophic natural event.

• It becomes extinct when the weather or climate changes from what is typical in its biome.

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Which factors below related to human activities threaten wild species with extinction?

• habitat destruction/fragmentation

• invasive species

• using plants for food

• pollution

• climate change

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What factors contribute to overexploitation of wild species?

• illegal trade

• good environmental practices

• illegal hunting

• growing populations

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What types of events have caused mass extinctions in the past?

• volcanic eruptions

• new species

• asteroid/comet impacts

• global climate change

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What legal protections are given to species under the Endangered Species Act (ESA)?

• They are not allowed to be hunted.

• The government cannot carry out projects that are harmful to the species or its habitat.

• It makes it illegal to come in contact with the endangered species.

• It gives funding for recovery of endangered species including rebuilding their habitats.

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Please, write one or two sentences below about what would make a mass extinction now different from ones in the past. There is no right or wrong answer.

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