Across
- 5. Organism that obtains its food by consuming other living things.
- 6. Photosynthetic algae found near the surface of the ocean.
- 9. Chemical substance that an organism needs to sustain life.
- 10. Factor Any living part of the environment with which an organism might interact.
- 11. Pyramid Illustration of the relative amounts of energy or matter contained within each trophic level in a given food chain or food web.
- 13. Process by which bacteria convert nitrates into nitrogen.
- 17. Organism that relies on other organisms for it's energy and food supply.
- 18. Cycle Process in which elements, chemical compounds, and other forms of matter are passed from one organism to another and form one part of the biosphere to another.
- 23. Organism that feeds on plant and animal remains and other dead matter.
- 25. Organism that obtains energy eating animals.
- 28. A group of similar organisms that can breed and produce fertile offspring.
- 29. Organism that obtains energy by eating only plants.
Down
- 1. Small free-floating animals that form part of plankton.
- 2. Organism that is able to capture energy from sunlight or chemicals and use it to produce it's own food from inorganic compounds.
- 3. Process used by plants and other autotrophs to capture light energy and use it to power chemical reactions that convert carbon dioxide and water into oxygen and energy-rich carbohydrates such as sugars and starches.
- 4. Web Network of complex interactions formed by the feeding relationships among the various organisms in an ecosystem.
- 6. Group of individuals of that same species that live in the same area.
- 7. Producer First producer of energy-rich compounds that are later used by other organisms.
- 8. Factor Physical or nonliving factor that shapes an ecosystem.
- 12. A group of ecosystems that share similar climates and typical organisms.
- 14. Process in which chemical energy is used to produce carbohydrates.
- 15. Animal that consumes the carcasses of other animals.
- 16. Assemblage of different populations that live together in a defined area.
- 18. Part of earth in which life exist including land, water, and air or atmosphere.
- 19. Organism that obtains energy by eating both plants and animals.
- 20. Nutrient: Single essential nutrient that limits productivity in an ecosystem.
- 21. Level Each step in a food chain or food web.
- 22. Total amount of living tissue within a given trophic level.
- 23. Organism that breaks down and obtains energy from dead organic matter.
- 24. All the organisms that live in a place together with their nonliving environment.
- 26. Scientific study of interactions among organisms and between organisms and their environment.
- 27. Fixation Process of converting nitrogen gas into nitrogen compounds that plants can absorb and use.