Chapter 4: Changes in Ecosystems

An ancient animal that used a trunk as elephants do today is :

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Some bacteria and mold can cause ................. that harm many living things:

• natural disasters

• drought

• diseases

• flood

Choose all the resources :

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........................ is when harmful materials get into the air, land, or water .

• Produce

• Population

• Pollution

• competition

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People know about organisms that lived long ago because of remains called ...................

• flood

• fossils

• extinct

• diseases

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...................... is a long period of time with no rain.

• disease

• flood

• wildfire

• drought

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I can save the environment by turning off the electricity, when I go to sleep.

• reduce

• reuse

• recycle

• resource

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An animal is endangered :

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Choose all the extinct animals :

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A ..................... can start when lightning strikes a dry area.

• drought

• flood

• wildfire

• disease

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