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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the statements that apply here about binary star system are

"have stars that might appear to wobble"

"often have one star that is brighter than other"

a binary star is a star system consisting of two stars revolving around their common barycenter. systems of two or more stars are called multiple star systems.