Question

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1 a stinging cell in a cnidarian. (9)
3 to grow again. (10)
4 a polypoid anthozoan. (7)
5 empty space. (6)
6 a shape with mouth and tentacles pointing upward like an anemone. (8)
10 a cnidarian such as a coral, sea fan, or an anemone. (9)
11 a scyphozoan with medusoid shape. (9)
12 a cnidarian such as a hydra or a fire coral. (9)

Explanation:

1. Cnidarians have specialized stinging cells called nematocysts, which match the 9-letter count.
2. "To grow again" refers to the biological process of regeneration, a 10-letter term.
3. A polypoid anthozoan that is 7 letters is a sea anemone, shortened to anemone.
4. "Empty space" in biological/ general terms that is 6 letters is vacuole, a cellular empty space.
5. The cnidarian body shape with mouth/tentacles upward is the polyp form, an 8-letter term.
6. Corals, sea fans, and anemones are all anthozoans, a 9-letter cnidarian class.
7. A scyphozoan with a medusoid shape is a jellyfish, a 9-letter organism.
8. Hydras and fire corals are hydrozoans, a 9-letter cnidarian class.

Answer:

1. Nematocyst
2. Regenerate
3. Anemone
4. Vacuole
5. Polypoid
6. Anthozoan
7. Jellyfish
8. Hydrozoan