SYMBIOSIS

3. a system of interactions between living things.
6. a rock-like substance made from the bodies of marine plants.
9. provide nutrients to allow something to grow.
10. a fixed pattern of behavior that happens naturally.
12. make another one of the same kind.
13. able to be kept at a certain level.
15. the process used by plants to convert light into chemical energy .
16. organisms that live on and gets nutrients from the body of another, unwilling organism.
17. a natural process where animals that have better adapted to their environment survive and pass on those adaptations to their young.

1. individuals or organizations with the goal of protecting the natural environment .
2. nutritious liquid composed mainly of sugar.
4. very small organisms unable to be seen by the human eye. some bacteria are beneficial, some are not.
5. individuals who care about looking after the environment .
7. animals that hunt and eat other animals.
8. the natural environment of a living thing.
9. characteristics of an object or living creature.
11. special characteristics .
14. a group of plants or animals that are alike in many ways.