The clam is known to be found in both marine and freshwater habitats and each clam varies in both size and age. To breathe the clam uses gills located in the bivalve mantle cavity, and there is an open blood circulation system as well. This bivalve mantle cavity also helps a lot with with nutriention as well. To eat the clam collects food with their tentacles and then from their is transported to the mouth where it is filtered into respiration water. Generally clams like to eat larvae, detritus, eggs, and Protozoa. A fun fact about clams, is that for reproduction, both fertilization and larvae development happen in free water, rather than the clam itself.
Here is a video describing the dissection of a clam:
http://youtu.be/Ebxhm6hA8io
Sources:
http://www.molluscs.at/bivalvia/
http://academic.evergreen.edu/t/thuesene/bivalves/Biology.htm
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