9. how is swarming adaptive for the worm?

The Palolo worm exhibits unique breeding behavior: during the breeding season, always at the same time of year and at a particular phase of the Moon, the worms break in half; the tail section , bearing reproductive cells, swims to the surface, where it releases eggs and sperm. Tens of thousands of epitokes swarm and release gametes simultaneously, attracting predatory fish and humans. The front section of the worm  remains below in the substrate.

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Explanation:

its temperature is increasing. this causes molecular vibrations to increase.