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Cell membranes serve as barriers and gatekeepers. ... Small polar molecules, such as water and ethanol, can also pass through membranes, but they do so more slowly. On the other hand, cell membranes restrict diffusion of highly charged molecules, such as ions, and large molecules, such as sugars and amino acids.
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Consumer pertains to any of the organisms in most trophic levels in a food chain, except for producers and decomposers. Consumers are also referred to as heterotrophs in contrast to autotrophs, which are the producers of the food chain. ... heterotroph.
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