Answer:When a cell needs to move a molecule many times, it uses vesicles. Vesicles are cellular organelles that are composed of a lipid bilayer. You can think of vesicles as cellular envelopes that are used to transport materials from one place to another. Vesicles also function in metabolism and enzyme storage as well.
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Changing their external environment
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Class, I guess ¿? :)dnsjjsjdjdjdjddj
Ribosomes can be compared to the cafeteria at a school