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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Glaucus/The Wonders of the Shore by Charles Kingsley: head, with a movable lower beak. The whole head keeps up a nodding
motion, and the movable beak occasionally opens widely, and then
suddenly snaps to with a jerk. It has been seen to hold an
animalcule between its jaws till the latter has died, but it has no
power to communicate the prey to the polype in its cell or to
swallow and digest it on its own account. It is certainly not an
independent parasite, as has been supposed, and yet its purpose in
the animal economy is a mystery. Mr. Gosse conjectures that its
use may be, by holding animalcules till they die and decay, to
attract by their putrescence crowds of other animalcules, which may
thus be drawn within the influence of the polype's ciliated
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