Plankton

2. Small crustaceans that are a common type of zooplankton.
6. Organisms that produce their own food through processes like photosynthesis.
7. Free-swimming aquatic organisms, such as fish and squid, capable of active movement.
8. Microscopic organisms that drift or float in aquatic environments.
9. Planktonic organisms that spend their entire life cycle in the planktonic phase.
11. A type of phytoplankton with a silica-based cell wall, often shaped like a glass shell.
12. Microscopic, photosynthetic organisms that form the base of the aquatic food chain.
13. A rapid increase in the population of planktonic organisms, often causing discoloration of the water.
15. Organisms that obtain their energy by consuming other organisms.

1. Small animals that feed on phytoplankton or other zooplankton.
3. Planktonic organisms that spend only a part of their life cycle as plankton.
4. Extremely small-sized plankton, smaller than microplankton.
5. Larger-sized plankton, visible under a microscope.
10. Unicellular algae that can be both phytoplankton and sometimes bioluminescent.
14. Pertaining to the bottom of a body of water; organisms living on or in the substrate.