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(also called selectively permeable membrane) a membrane which allows some substances to cross it, but not others.
many-celled, complex organisms with cell differentiation and specialised tissues performing life...
outgrowths of neurons (nerve cells) that transmit nerve impulses towards the cell body.
a disease caused by the bacterium Vibriocholera, which produces a toxin in the lining of the...
a disease caused by the human immunodeficiency virus (HIV).