( It ( ( ( ( ( ( undergoes ( more changes ) ) ( than ( the ( maritime ( arctic ( air mass ) ) ) ) ) ) , ) and ) ( ( warms up ) ( to ( ( the ( water temperature ) ) ( at ( its ( lower levels ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VP (VBZ undergoes) (NP (JJR more) (NNS changes)) (PP (IN than) (NP (DT the) (JJ maritime) (JJ arctic) (NN air) (NN mass)))) (, ,) (CC and) (VP (VBZ warms) (PRT (RP up)) (PP (TO to) (NP (NP (DT the) (NN water) (NN temperature)) (PP (IN at) (NP (PRP$ its) (JJR lower) (NNS levels))))))) (. .)))
It undergoes more changes than the maritime arctic air mass, and warms up to the water temperature at its lower levels.
(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))))))))) (. .)))