Changes in Ecosystems

Why do chipmunks in the Great Smoky Mountains survive?

• They have driven out all other chipmunks.

• Their needs are met in that environment.

• Humans feed them, which helps them survive.

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Which describes a balanced ecosystem?

• No animal or plant drives out other animals or plants.

• One type of animal and plant depend on each other.

• 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

• less foxes that eat fewer rabbits

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How do the grass and rabbits help balance where they live?

• 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 become sick and died?

• The foxes would find new prey.

• The foxes and rabbits would compete for food.

• The number of foxes would decrease because they are running out of food.

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A ___________________ is an organism that feeds on and harms a living thing. (Ex. This would be the fleas on a dog.)

• parasite

• host

• hazardous waste

A ___________________ is an organism that provides energy or an environment for another organism. (Ex. This would be the dog for the fleas.)

• parasite

• host

• hazardous waste

Which would cause an ecosystem to change quickly?

• a lake drying up

• a climate change

• an earthquake

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

• no change

• a change in kinds of plants and animals

• a change from a forest to marsh

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

• Fish once had legs to travel.

• The desert was once a sea or lake.

• Fish once lived in dry places.

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