Abalance must exist between substances entering and exiting cells. most animals take in substances by

eating
sweating
breathing
urinating

eating and breathing

Explanation:

when you eat you get all the nutrients and vitamins your body and when you breath you get the oxygen your body needs in addition to other gases that are helpful for the body

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primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs