The cell membrane a. controls which substances enter and exit the cell. b. alters and packages proteins and lipids. c. is the site of most cellular chemical reactions. d. converts glucose to other energy molecules.

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Below, the levels of organization in a multicellular organism are shown from least to most complex. which level of organization can be described as several different types of tissues working together to perform a common task?

Which situation is an example of not doing work? lifting a couch throwing a baseball running up stairs carrying a box