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'''biological structure''' ([[Category:Noun]][[:Category:Noun|noun]], ''pl.'' biological structures) – any part of an organism including the entire body of the organism whether large and easily observed or microscopically small and only examined or analyzed with special scientific instruments (optical, analytical, etc.). Biological structures are typically organized within a modular natural hierarchy. Thus, [[organ]]s are composed of [[tissue]]s, or (if tissues are not formed) of [[cell aggregate]]s like fungal [[hyphae]]. Tissues or cell aggregates are formed of [[cell]]s and cells are composed of [[cell organelle]]s. Very small structures of an organism that can only be observed with the light microscope are typically referred to as the [[anatomy]]. Structural parts of cells that are even smaller and can only be studied with the transmission electron microscope (TEM) are referred to as [[fine structure]] or [[ultrastructure]].

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