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a watery fluid in which organelles are suspended.
the movement of respiratory gases across a respiratory surface.
a structure that is used by molluscs for feeding. It is a minutely toothed, chitinous ribbon...
endocrine gland situated on top of each kidney, which produces hormones in response to stresses...
involuntary muscle found in the walls of blood vessels, in digestive, respiratory, urinary and...
skeletal muscle found all over the body, attached to the skeleton.