Plankton

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Across
  1. 1. eat phytoplankton
  2. 4. phytoplankton turn into this when they undergo photosynthesis
  3. 5. eaten by zooplankton, base of the food chain
  4. 6. caused by red phytoplankton
  5. 8. single-celled life form
  6. 9. a type of phytoplankton, grows on rocks
Down
  1. 2. a process in which plants make food
  2. 3. home of the plankton
  3. 7. animals eating other animals