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(also called selectively permeable membrane) a membrane which allows some substances to cross it, but not others.
single-celled algae that have two flagella and are found mainly in seawater but are also common...
a graphical representation of the evolutionary relationship between taxonomic groups based on...
a state in which the body temperature has dropped to dangerously low levels.
the cavity used for transport purposes. It has one opening to the environment through which...