What is a common pliocene
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Pliocene Epoch is the timescale between 5.33 my to 2.58 my. It includes fossilized remains of primates and human including  Ardipithecus ramidus, Australopithecus anamensis, Australopithecus afarensis, Australopithecus garhi, and Australopithecus africanus.  

the way that the mass of carbon can be conserved through cellular respiration is through a process/law called the law of conservation of mass which even tho it undergoes a process, mass is not be destroyed or changed

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.