Plan - Crossword Labs

3. Level: The position an organism occupies in a food chain, indicating its feeding relationship to other organisms.
8. Free-swimming aquatic organisms, such as fish and squid, capable of active movement.
11. Zooplankton that remain in the planktonic phase throughout their entire life cycle.
12. Small animals that feed on phytoplankton or other zooplankton.
13. Tide: A bloom of harmful, often toxic, phytoplankton that can lead to the discoloration of water.
16. A rapid increase in the population of planktonic organisms, often causing discoloration of the water
17. Planktonic organisms that spend their entire life cycle in the planktonic phase.
18. Small crustaceans that are a common type of zooplankton.
19. Microscopic, photosynthetic organisms that form the base of the aquatic food chain.

1. Larger-sized plankton, visible under a microscope.
2. Pertaining to the bottom of a body of water; organisms living on or in the substrate.
4. A close and long-term interaction between different biological species.
5. Depth: The depth in the water column where the rate of photosynthesis equals the rate of respiration.
6. Extremely small-sized plankton, smaller than microplankton.
7. Microscopic organisms that drift or float in aquatic environments.
9. Organisms that produce their own food through processes like photosynthe
10. Planktonic organisms that spend only a part of their life cycle as plankton.
11. Organisms that obtain their energy by consuming other organisms.
14. Unicellular algae that can be both phytoplankton and sometimes bioluminescent.
15. A type of phytoplankton with a silica-based cell wall, often shaped like a glass shell.