Plankton

1. Extremely small-sized plankton, smaller than microplankton
6. A close and long-term interaction between different biological species
8. A type of phytoplankton with a silica-based cell wall, often shaped like a glass shell.
9. Larger-sized plankton, visible under a microscope
11. Small animals that feed on phytoplankton or other zooplankton
14. Planktonic organisms that spend their entire life cycle in the planktonic phase
17. The depth in the water column where the rate of photosynthesis equals the rate of
20. Unicellular algae that can be both phytoplankton and sometimes bioluminescent.
21. other organisms

2. Free-swimming aquatic organisms, such as fish and squid, capable of active movement
3. Microscopic, photosynthetic organisms that form the base of the aquatic food chain.
4. Zooplankton that remain in the planktonic phase throughout their entire life cycle
5. Organisms that produce their own food through processes like photosynthesis.
7. The position an organism occupies in a food chain, indicating its feeding relationship
10. Small crustaceans that are a common type of zooplankton
12. Microscopic organisms that drift or float in aquatic environments.
13. Planktonic organisms that spend only a part of their life cycle as plankton
15. Pertaining to the bottom of a body of water; organisms living on or in the substrate
16. A bloom of harmful, often toxic, phytoplankton that can lead to the discoloration of water.
18. A rapid increase in the population of planktonic organisms, often causing discoloration of the
19. Organisms that obtain their energy by consuming other organisms.