The relationship between the hermit crabs and the snails is A.commensalism
Why? Commensalism refers to a relationship where one organism benefits from the other without affecting it. In this case, the hermit crab benefits from the snails, via the latter's discarded shells. The crab's use of the snails' shells has no impact on the snails.
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No they surround the atom
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The result of the initial rotation of the cloud of gas and dust that condensed to form the Sun and planets. As gravity condensed the clouds, of angular momentum increased the rotational speed and flattened the cloud out into a disk.