Ecosystem Changes Over Time

Field mice eat corn. Which would most likely happen if the field mouse population grew?

• There would be more corn to feed the field mice.

• There would be less corn due to the mice eating it.

• The habitat would get overpopulated because the mice would eat too much.

• There would be no change

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Humans are part of the ecosystem and therefore impact it. Which of the following events in an ecosystem may produce a negative effect?

• A lumber company clearing a forest

• preventing deer from depleting food resources

• Wildlife ranger minimizing disturbances

• Restoring a natural habitat

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Farmers in the middle section of the country grow crops that feed many people. Suppose that over a period of several years the region receives far less rainfall than normal, reducing the size of crops grown in the area. The lack of precipitation in an area over a prolonged period of time is a ____________.

• Desert

• Deposition

• Drought

• Monsoon

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How does too much fishing in an area affect its ecosystem?

• The fish will lay many more eggs to replace fish caught.

• Organisms that eat fish could become endangered due to starvation

• There will be no change in organism that eat fish

• People could eat too many fish and become ill

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A hurricane sweeps across a small Caribbean island, killing 50% of the herbivore species on the island. Which of the following is the most immediate result?

• A reduction in biodiversity

• An increase in predator populations

• An acceleration of the carbon cycle

• A decline in decomposer populations

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Which is NOT an example of a natural environmental change?

• Flooding

• Hurricane

• A volcanic eruption

• A housing development

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Burning fossil fuels adds carbon dioxide to the air. What could be done to reduce the amount of carbon dioxide and increase the amount of oxygen in areas where fossil fuels are burned?

• Driving cars

• Burning our trash

• Building houses

• Planting trees

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How can humans best help an endangered species avoid extinction?

• They can feed the animals

• They can put the animals in a zoo

• They can protect the animal's habitat

• They can take the animal to new habitats

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What is one way an animal can change the ecosystem?

• Chipmunks can hibernate through winter

• Arctic foxes fur changes from brown to white in the winter

• Salmon migrate to lay their eggs

• Beavers build a dam on a stream to create their homes

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What is one negative way people can change ecosystems?

• breathing air

• building a house

• riding a bike

• playing soccer

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