Interactions and Ecosystems

3. A group of individuals of the same species living in the same area.
6. An animal that eats only plants.
7. An animal that eats only other animals.
9. Things an organism must have to survive.
12. All the living and non-living things in an area interacting together.
15. Different populations living and interacting in the same area.
16. Organisms that must eat other organisms for energy.
17. The gas produced by plants during photosynthesis that humans need to breathe.
18. Organisms (like plants) that make their own food.
19. A relationship where both species benefit.

1. An animal that eats both plants and animals.
2. A group of similar organisms that can breed and produce fertile offspring.
4. A relationship where one organism lives on or in another and harms it.
5. The non-living parts of an environment.
8. Things that are desired but not necessary for survival.
10. The living or once-living parts of an environment.
11. Organisms that break down dead plants and animals.
13. A relationship where one species benefits and the other is neither helped nor harmed.
14. The process by which plants use sunlight to make food.