Kind of exoskeleton
What kind of exoskeleton do some molluscs present?
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Some molluscs, like bivalves and gastropods, secrete an exterior calcareous carapace (the shell). Calcium carbonate is secreted by the mantle, a fold in the epidermis, forming the shell. In pelecypods, the shell is made of two valves that articulate and contain an individual body. In gastropods the shell contains only portion of the body, that is, the visceral mass.
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Illustrate out the life cycle of the schistosome?
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Devoid of the saturation of transport proteins and under the similar concentration gradient how the speeds of simple diffusion can be compared to the speed of the facilitated diffusion?
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