Changes in Ecosystems

Why do chipmunks survive in the Great Smoky Mountains?

• Their parents take care of them.

• The park rangers take care of them.

• They get lots of sunshine.

• Their needs are met.

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In a balanced ecosystem

• Only plants survive.

• Animals are in charge.

• No animals or plants drive out other animals and plants.

• There are no predators.

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If a meadow has too many rabbits, to help it become balanced...

• needs more carrots

• needs more foxes that eat rabbits

• needs more bunny hatches

• needs more Elmer Fudd

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Oxygen, made by grass, that animals use is a way organisms interactions help

• animals become vegetarian

• create more carbon dioxide

• decrease the number of animals

• balance the ecosystem

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

• time for more foxes

• ecosystem would be destroyed

• number of foxes would decrease

• it would be balanced

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A parasite

• hurts itself

• hurts one organism and helps another

• is two sites

• is helpful to everyone

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Succession is

• quick change from a natural disaster

• to be able to win

• ecosystems that have no change

• process of gradual change from one community of organisms to another

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What can cause an ecosystem to change quickly?

• Planting trees

• Introducing new animals

• An earthquake

• The water cycle

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If an ecosystem changes from being rainy to dry...

• plants can change

• animals can change

• plants and animals can change

• plants and animals won't change

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What can scientist tell from a fish fossil found in the desert?

• someone lost their fish

• the desert was once a sea or lake.

• it is fake

• fish once had legs to travel

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