How long do sea urchins sleep for?

How long do sea urchins sleep for?
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Do sea urchins have teeth?

Description : Do sea urchins have teeth?

Last Answer : Sea urchins have a teeth-like structure juxtaposed to the mouth and made of five teeth connected to ossicles and muscle fibers. This structure, known as Aristotle’s lantern, is use to scratch food, mainly algae, from marine rocks.

If we were to completely eliminate one group of marine organisms from the ocean, which would most likely be fatal to marin fish populations? Elimination of: a) urchins b) diatoms (pron: DIE-a-toms) c) starfishes d) sea anemones (pron: a-NEM-a-nees)

Description : If we were to completely eliminate one group of marine organisms from the ocean, which would most likely be fatal to marin fish populations? Elimination of: a) urchins b) diatoms (pron: DIE-a-toms) c) starfishes d) sea anemones (pron: a-NEM-a-nees)

Last Answer : ANSWER: B -- DIATOMS