Chapter 4 Scott Foresman

Why do chipmunks in the Great Smoky Mountains survive?

• their needs are met in that environment

• they have driven out all other chipmunks

• humans feed them, which helps them survive

• humans have moved them from cities to the mountains

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Which describes a balanced ecosystem?

• there is enough food for people to exist

• one type of animal and plant depend on each other

• no animal or plant drives out other animals or plants

• humans create shelter and food for animals and plants

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A meadow has too many rabbits. What would help balance this ecosystem?

• more rain that grass needs

• more foxes that eat rabbits

• fewer foxes that eat rabbits

• more grass for rabbits to eat

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How do these organisms interactions help balance their ecosystem?

• rabbits make homes in grass

• grass and rabbits both need oxygen

• grass depends on rabbits to protect it

• grass makes oxygen, and animals use it

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How would an ecosystem change if the rabbits that were the main prey for foxes became sick and died?

• the foxes would find new prey

• the number of foxes would decrease

• the number of foxes would increase

• the foxes and rabbits would compete for food

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What impact does a parasite have in an ecosystem?

• helps the entire ecosystem

• hurts one organism and helps another

• helps both the host organism and the parasite

• hurts both the host organism and the parasite

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Which would cause an ecosystem to change quickly?

• an earthquake

• a lake drying up

• a climate change

• a lake becoming a marsh

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What might be the effect on an ecosystem of a climate change from rainy to dry?

• no change

• a change from plants to animals

• a change from forest to marsh

• a change in the kinds of plants and animals that live there

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What could scientists tell from a fish fossil found in the desert?

• that fish is now extinct

• fish once had legs to travel

• fish once lived in dry places

• the desert was once a sea or lake

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What might be a reason an animal becomes extinct?

• it is a predator

• it produces oxygen

• its habibat is destroyed

• it adapts to its environment

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