Difficult - Blue Planet II Ep 5

4. The synchronized mass release of eggs and sperm by herring, turning the water milky white.
7. A bright orange fish that aggressively defends its kelp nest from intruders.
11. A master of disguise that uses pulsing color patterns to mesmerize prey.
12. are 20 more difficult crossword clues and answers from Blue Planet II, Episode 5 ("Green Seas"), focusing on specific species names, specialized biological behaviors, and ecological terms from the episode.
13. The root-like structure that anchors giant kelp securely to the rocky reef.
15. A type of crab that covers its shell with seaweed and anemones for camouflage.
17. A bizarre, glowing colony of thousands of tiny organisms shaped like a tube.
19. A spindly-armed relative of the starfish that carpet the ocean floor in vast numbers.
20. A small, shrimp-like crustacean that thrives in the dense canopy of seagrass meadows.
21. Dead organic matter and decaying kelp that provides vital food for the seabed community.

1. The large, leaf-like structure of the giant kelp that absorbs sunlight.
2. The gas-filled bladder that keeps kelp blades floating upright toward the sunlight.
3. A small, translucent fish found seeking refuge among the stinging tentacles of jellyfish.
5. The specialized aerial root that allows mangrove trees to breathe in oxygen-poor mud.
6. A tiny plant or organism that grows harmlessly on the surface of seagrass blades.
8. A tiny, translucent crustacean that is a primary food source for herring.
9. The cooperative relationship seen between the giant kelp and the organisms living within it.
10. Microscopic marine plants that drift in the sunlit surface waters.
14. The cloudiness of the water caused by dense plankton blooms and suspended nutrients.
16. The process where deep, cold, nutrient-rich water is pushed to the surface.
18. A barrel-shaped, gelatinous tunicate that filters plankton and can form massive chains.