Human Activities & Ecosystems

How do human activities change and harm ecosystems?

• By increasing biodiversity

• By reducing pollution

• By causing pollution

• By conserving natural resources

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What is one way farms can contribute to pollution?

• By planting more trees

• By using pesticides or fertilizers

• By conserving water

• By using renewable energy

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What happens when trees are cut down in an area?

• Increase in local temperatures

• Decrease in local temperatures

• Increase in rainfall

• Decrease in air pollution

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What can happen to an ecosystem if animals cannot interact with each other and their surroundings?

• The ecosystem will thrive

• The ecosystem will not thrive

• The ecosystem will become more diverse

• The ecosystem will become more stable

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What is point-source pollution?

• Pollution that comes from multiple sources

• Pollution that comes from one source

• Pollution that comes from natural sources

• Pollution that comes from unknown sources

Which of the following is an example of point-source pollution?

• Fertilizers

• Pesticides

• Oil spills

• Plastic bags

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What is nonpoint-source pollution?

• Pollution that comes from a single source

• Pollution that comes from multiple sources

• Pollution that comes from the ocean

• Pollution that comes from the air

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What is the main consequence of overfishing on ocean species?

• Increase in fish population

• Stability of ocean food webs

• Local extinction of species

• Decrease in human population

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How does coastal development impact natural coastlines?

• It preserves mangrove forests

• It stabilizes sandy soil

• It destroys coastal habitats

• It reduces pollution

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What role do mangrove forests play in coastal ecosystems?

• They increase pollution

• They stabilize sandy soil and prevent erosion

• They divide habitats

• They reduce fish populations

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