How Ecosystems Clean Earth's Water

What is an ecosystem?

• A place where only plants grow

• A system where organisms and nonliving things interact

• A type of weather pattern

• A large body of water

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What does biodiversity refer to?

• The number of trees in a forest

• The variety of species in an ecosystem

• The amount of water in a lake

• The temperature of a region

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Why is biodiversity important in an ecosystem?

• It makes the ecosystem look pretty

• It helps the ecosystem become stronger and less likely to break down

• It increases the temperature of the ecosystem

• It decreases the amount of sunlight in the ecosystem

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What is one service that healthy ecosystems provide to humans?

• Producing electricity

• Filtering water

• Creating deserts

• Increasing pollution

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What is the role of wetlands in an ecosystem?

• They are used for building houses

• They help filter and clean water

• They are places where only fish live

• They increase air pollution

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What does a healthy ecosystem indicate?

• High levels of pollution

• Low biodiversity

• Balanced interactions between organisms and their environment

• Lack of water

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Which is NOT a benefit of ecosystems?

• Providing food

• Cleaning air and water

• Increasing harmful substances

• Moving nutrients

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What happens when an ecosystem is not healthy?

• It becomes stronger

• It is more likely to break down

• It produces more food

• It filters more water

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What indicates a healthy ecosystem?

• High levels of biodiversity

• Low levels of biodiversity

• No interaction between organisms

• High levels of pollution

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How do ecosystems help in nutrient movement?

• By stopping nutrient flow

• By moving nutrients to where they are needed

• By destroying nutrients

• By storing nutrients permanently

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