Ch 4 Review - Living Things Change Their Environments

The organisms that cause the most changes to the environment are __________.

• Humans

• Plants

• Microorganisms

• Animals

Plants and animals can lose their __________ when people clear forests.

• habitats

• water

• populations

• environment

Pollution increases when __________ are drained.

• wetlands

• forests

• praries

• oceans

An organism that is new to an environment can harm it by competing for __________ that other plants and animals need.

• resources

• habitats

• predators

• climates

You protect the environment when you __________ the amount of paper you use.

• reduce

• increase

• ignore

• waste

You protect the environment when you __________ newspapers to line pet cages.

• reuse

• recycle

• discard

• burn

Businesses protect the environment when they __________ old newspapers into new paper products.

• recycle

• reuse

• burn

• discard

When you plant a tree, you help keep __________ from washing away.

• soil

• water

• leaves

• sand

Reducing, reusing, and recycling paper products helps plants and animals by:

• Reducing deforestation and habitat destruction

• Increasing pollution and waste

• Decreasing oxygen production

• Causing soil erosion

________ is to turn old things into new things

• recycle

• competition

• reduce

• pollution