what's the stage in development of humans in which the embryo consists of a layer of cells surrounding a cavity?​

Ifound this information on google “yes. they have a mouth and brain at one end and an anus at the opposite end. what characteristics distinguish an annelid from other worms? annelids have segmented bodies and a coelem which is a tube filled with fluid and contains most of the organs.“ i hope it you

Your answer will be b action plan.

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Bees shall never produce milk no matter what but this is a joke and the answer is a breast that produces milk.