unicorn

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Across
  1. 4. - the process of making food using chemicals instead of sunlight
  2. 9. - an organism that carries and spreads disease-causing pathogens
  3. 10. - a single-celled organism that moves using flagella and lives mostly in water
  4. 11. - a hard outer covering or shell of some microscopic organisms
  5. 13. - the hard outer shell of a diatom made of silica
  6. 15. - one half of a diatom’s shell
  7. 16. - a type of toxic dinoflagellate that can harm fish and water ecosystems
  8. 18. - the buildup of harmful substances in an organism over time
Down
  1. 1. fission - a type of asexual reproduction where one cell splits into two identical cells
  2. 2. - whip-like structures that help cells move
  3. 3. - a tiny infectious particle that can only reproduce inside a living cell
  4. 5. - layered rock-like structures formed by ancient cyanobacteria
  5. 6. - tiny algae that live inside coral and provide food through photosynthesis
  6. 7. - tiny hair-like structures that help cells move or move substances around them
  7. 8. - blue-green bacteria that use photosynthesis to make food
  8. 10. - dead organic matter such as leaves, plants, and animal remains
  9. 12. - a microscopic algae with a glass-like cell wall
  10. 14. - a temporary arm-like extension used by some cells for movement and eating
  11. 17. bloom - a rapid increase of algae in water that can harm aquatic life