| A | B |
|---|
| habitat | the place where an organism lives |
| carrying capicity | the number of individuals that an environment can support |
| ecology | the study of the interactions among living things and the nonliving things in their environment |
| ecosystem | the interactions among the populations of a community and the nonliving things in their environment |
| acid rain | rain that is caused by pollution and is harmful to organisms because it is too acidic |
| endangered | there are almost no animals left of a certain species |
| threatened | there are fewer animals left of a species than there used to be |
| extinct | all the members of a species have died |
| fossil fuels | fuels formed millions of years ago from the remains of plants and animals |
