A Natural Balance

to be arranged or put into groups

• illegal

• classified

• species

• extinct

waste, chemicals, and gases that have harmful effect

• extinct

• population

• pollution

• classified

The total number of plants or animals in a group

• species

• extinct

• pollution

• population

a related group of animals or plants

• population

• species

• problem

• illegal

at risk of disappearing forever

• endangered

• illegal

• classified

• species

no longer living

• extinct

• population

• problem

• endangered

All of the living and nonliving things that surround a person, an animal, or a plant

• extinct

• endangered

• environment

• species

against the law

• extinct

• environment

• illegal

• problem

My _____ cousin played a trick on me!

• sneaky

• kind

• purple

• tired

I laughed out loud when I read the _____ book

• clean

• comic

• serious

• sneaky