Select all that apply. a balance must exist between substances entering and exiting cells. most animals take in substances by eating sweating breathing urinating

Its isn't sweating nor urinating because that is to export out of the body

if it were my opinion it would be eating because eating brings in most of the nutrients and other necessities for the body

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".