( ( Appropriate behavior ) ( ( is ( ( therefore ( a must ) ) ( to ( guarantee ( ( a ( ( ( safe and ) rewarding ) experience ) ) ( for ( ( ( both ( the animals ) ) and ) trainers ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Appropriate) (NN behavior)) (VP (VBZ is) (VP (VBG therefore) (NP (DT a) (MD must)) (S (VP (TO to) (VP (VB guarantee) (NP (NP (DT a) (ADJP (JJ safe) (CC and) (JJ rewarding)) (NN experience)) (PP (IN for) (NP (NP (PDT both) (DT the) (NNS animals)) (CC and) (NP (NNS trainers)))))))))) (. .)))
Appropriate behavior is therefore a must to guarantee a safe and rewarding experience for both the animals and trainers.
(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))))))) (. .)))