Across
- 3. The natural home or environment of an animal, plant, or other organism.
- 4. A system of interlocking and interdependent food chains.
- 8. A series of organisms each dependent on the next as a source of food.
- 10. The series of processes by which carbon compounds are inter-converted in the environment, involving the incorporation of carbon dioxide into living tissue by photosynthesis and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels.
- 11. A process in which substances combine chemically with oxygen from the air and typically give out bright light, heat and smoke.
Down
- 1. The animals of a particular region, habitat, or geological period.
- 2. Devoid of life.
- 5. The surroundings or conditions in which a person, animal, or plant lives or operates.
- 6. Relating to or resulting from living organisms.
- 7. The plants of a particular region, habitat, or geological period.
- 9. A biological community of interacting organisms and their physical environment.