( ( Human ( and ( animal ( ( brains and ) behaviors ) ) ) ) ( ( experience ( ( similar changes ) ( regarding ( ( reward systems ) ( because ( they ( both ( are ( so prominent ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Human) (CC and) (NN animal) (NNS brains) (CC and) (NNS behaviors)) (VP (VBP experience) (NP (NP (JJ similar) (NNS changes)) (PP (VBG regarding) (NP (NP (NN reward) (NNS systems)) (SBAR (IN because) (S (NP (PRP they)) (DT both) (VP (VBP are) (ADJP (RB so) (JJ prominent))))))))) (. .)))
Human and animal brains and behaviors experience similar changes regarding reward systems because they both are so prominent.
(ROOT (S (NP (NNP Animal) (NNS behaviors)) (VP (VBP are) (VP (VBN controlled) (PP (IN by) (NP (NP (DT both) (NNS genes) (CC and) (NNS experiences)) (PP (IN in) (NP (DT a) (VBN given) (NN envionment))))))) (. .)))