From complex to simple
A crustacean has been a mystery to marine biologists: they knew the larva, a creature called larva Y, but they had no idea what the mature form was like. To solve the mystery, a group of Danish biologists take the larva and raise it in the laboratory of the University of Copenhagen. The result is surprising: the animal resulting from metamorphosis is a much simpler way of life than the larva itself.
Adult crustaceans have no digestion or nervous system. It is a living simple in the form of a sack. And what happens is that it is very rare to create in nature a complex and simple structure. Biologists have proposed an explanation if the mature form of crustacean is parasitic, perhaps of corals. However, they will have to prove whether that is true; the resolution of the mystery creates a new mystery.
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