Across
- 1. a chemical process by which green plants and some other organisms make their food. Plants use energy from the Sun to turn water and carbon dioxide into food, and they produce oxygen as a by-product.
- 3. An environmental factor that affects the survival of living things and restricts the size of a population.
- 4. An organism that produces its own food and serves as a source of food for other organisms.
- 6. A naturally occurring chemical compound composed of two oxygen atoms. Its is normally found in its gas form.
- 8. An animal that feeds on organisms that have already died or that have been killed by another animal.
- 10. An animal that only eats plants.
- 11. Plants or animals that take over in areas where they do not normally live.
Down
- 2. An animal that eats both plants and meat.
- 5. a graphical representation designed to show the number of animals in a food web.
- 7. Substances such as proteins, minerals, or vitamins that are needed by people, animals, and plants to stay strong and healthy.
- 8. A group of living things that share certain traits and can produce offspring.
- 9. The specific role that a plant or animal has within an ecosystem.
