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5. A community of living organisms interacting with their physical environment.
7. Organisms that break down dead plants and animals into simpler substances.
8. Microscopic organisms that drift in oceans and produce much of Earth’s oxygen.
13. Organisms that obtain energy by eating other organisms.
14. Organisms that use light energy to make food through photosynthesis.
16. Living organisms or biological components of an ecosystem.
18. Animal that mainly eats other animals.
19. Organisms that obtain energy from chemical compounds.

1. Total mass of living organisms in a given area or ecosystem.
2. Process of producing food using chemical energy instead of sunlight.
3. Organism that feeds on dead and decaying organic matter.
4. Organisms that cannot make their own food and must consume others.
6. Photosynthetic bacteria often called blue-green algae.
8. Process by which plants and some microorganisms use sunlight to make food.
9. Organisms that make their own food and form the base of food chains.
10. Nonliving factors in an environment such as sunlight, water, and temperature.
11. Organisms that produce their own food from inorganic substances.
12. Animal that eats mostly plants.
15. Consumer The first level of consumers in a food chain that eat producers.
17. Animal that eats both plants and animals.