Unit 3

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Across
  1. 2. so small as to be seen only with a microscope
  2. 6. an organism that lives in or on another organism and receives benefits, usually while harming the other organism
  3. 9. shared
  4. 10. the process by which green plants use the sun’s energy to make food
  5. 11. the green substance found in most plants
  6. 12. single-celled organisms that have plant, animal, or fungus characteristics
  7. 13. very tiny living organisms
  8. 14. a group of organisms belonging to the same ecosystem
Down
  1. 1. the end of or the dying out of a type of organism
  2. 3. organisms that eat other organisms
  3. 4. organisms that make their own food
  4. 5. organisms that break down dead organisms
  5. 7. a simple plant that forms a crust-like growth on rocks or tree trunks
  6. 8. simple, nonflowering plant that is usually found in or around water
  7. 11. the process by which some organisms use chemical energy to make food