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Explanations for adaptations-favouring-survival-of-broods quiz. The "not so good" possibilities are:

3. smaller brood-individuals shelter under larger ones. Explanation: this is not such a bad idea, but the size differential among brood members would probably never be great enough to warrent all the shuffling about, nor is it clear that new infoldings of the epithelium would be created to accommodate continual changes in position of the brood as they do their shuffling.

8. adults accommodate brood within pharynx in response to a predatory attack. Explanation: this is not likely for obvious reasons (digestive enzymes, oxygen lacking or in low concentration, no food).

The remaining "good" suggestions appear not to have been investigated:

1.  tentacles grow longer to increase protective canopy.
2.  “attack” tentacles develop to ward off predators.
4.  more nematocysts are produced in the tentacles.
5.  brooding adults move closer together.
6.  more tentacles are produced for greater protection.
7.  adults crawl more readily and quickly when carrying a brood.

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