1. Vocabulary and pictures

2.  A group of organisms of one kind that live together in one location.

4.  A group of populations that live together.

6.  A role or job an organism has in an ecosystem.

8.  A kind of contest among populations with the same niche.

10.  A trait or characteristic that helps an organism to survive.

12.  Body structures that help an animal to survive.

14.  Actions that help an animal to survive.

16.  The movement of animals from one area to another in a regular cycle.

18.  The death of all the organisms of a species.

20.  Conditions in an ecosystem that keep a population from growing beyond a certain size.

22.  An animal that kills and eats other animals.

24.  An animal that is killed and eaten by another animal (predator).

26.  Helpful

28.  Does not help or harm; has no effect on

30.  Harmful