Unit 3 Review

Which of these is a natural ecosystem change?

• pollution

• drought

• using natural resources

• all of these

Which of these is a man-made ecosystem change?

• pollution

• catching a ride

• building

• all of these

Why is it bad for an animal to be taken to a new place where it has no predators?

• The animal might eat all the plants and leave no food for other animals.

• The animal might become food for another animal.

• The animal might not survive in the new habitat.

• all of these

When people put harmful things in the air, water, or soil that can cause plants to die and animals to get sick, it is called _____.

• conservation

• building

• using natural resources

• pollution

Which example of pollution can make animals sick?

• all of these

• People can throw their trash on the ground.

• Factories and cars put smoke into the air.

• Ships carrying oil can leak or spill the oil into the ocean.

Which of these can cause plants and animals to become endangered?

• pollution

• disappearing habitats

• overhunting by human

• all of these

Choose 3 causes of deforestation.

• decreases absorption of carbon emissions

• agriculture (farming)

• road building

• wildfires

• soil erosion

Choose 3 causes of deforestation.

• building towns and cities

• logging

• loss of habitats and species

• mining

• disrupts the water cycle

Choose 2 effects of deforestation.

• building towns and cities

• wildfires

• logging

• loss of habitats and species

• soil erosion

How can we help to reduce deforestation? Choose 3 answers.

• carpool

• use products made from recycled materials

• plant trees to replace those that are cut

• recycle can and bottles

• create policies to protect forests