( ( ( ( The ( less handling ) ) and ) temperature ) ( ( changes ( they ( must ( ( undergo , ) ( the better ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT The) (JJR less) (NN handling)) (CC and) (NP (NN temperature))) (VP (VBZ changes) (SBAR (S (NP (PRP they)) (VP (MD must) (VP (VB undergo) (, ,) (ADVP (DT the) (RBR better))))))) (. .)))
The less handling and temperature changes they must undergo, the better.
(ROOT (S (NP (NNS Ectotherms)) (VP (VBP undergo) (S (NP (NP (DT a) (NN variety)) (PP (IN of) (NP (NP (NNS changes)) (PP (IN at) (NP (DT the) (JJ cellular) (NN level)))))) (VP (TO to) (VP (VB acclimatize) (PP (TO to) (NP (NP (NNS shifts)) (PP (IN in) (NP (NN temperature))))))))) (. .)))