Ecosystems and Matter Cycle - Why do you have to clean a fish tank but nor a pond?

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Across
  1. 3. An organism that is usually a decomposer; some cause illness.
  2. 5. Cycle The process of carbon moving through living things and the environment.
  3. 7. Any living thing.
  4. 9. A living thing that eats other living things.
  5. 13. A living thing that can break down dead plants, dead animals, or animal waste.
  6. 14. Tiny, floating living things in water that are smaller than algae and produce their own food, like plants.
  7. 15. A living thin that is a decomposer and has spores, such as a mold or mushroom.
  8. 17. A substance that living things need to grow and stay healthy.
  9. 18. Tiny living things in water that produce their own food like plants do.
Down
  1. 1. A set of events that repeats in the same order over and over.
  2. 2. The gases that surround a planet.
  3. 4. A type of gas that plants sometimes take in and that animals release when they breathe.
  4. 6. A type of gas that plants release and animals breathe in.
  5. 8. A pretend version of something that scientists use when the real thing is too big, small, or complicated to work with.
  6. 10. All the living things that interact with each other and their environment in one place.
  7. 11. A living thing that makes its own food.
  8. 12. Anything that takes up space and has weight; it can be in different forms such as solid liquid, or gas.
  9. 16. A group of things that affect each other and function as a whole.