OpenStudy (anonymous):
Mollusks are sometimes hard to classify because there are not a lot of characteristics they all share.
OpenStudy (anonymous):
"Molluscs have such a varied range of body structures that it is difficult to find defining characteristics that apply to all modern groups. The two most universal features are a mantle with a significant cavity used for breathing and excretion, and the structure of the nervous system. As a result of this wide diversity, many textbooks base their descriptions on a hypothetical "generalized mollusc". This has a single, "limpet-like" shell on top, which is made of proteins and chitin reinforced with calcium carbonate, and is secreted by a mantle that covers the whole upper surface. The underside of the animal consists of a single muscular "foot"
OpenStudy (anonymous):
whoa o: okay thank you!
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