( Mammals ( ( attempt ( to ( ( ( maintain ( a ( comfortable ( body temperature ) ) ) ) ( under ( various conditions ) ) ) ( by ( ( thermoregulation , ) ( part ( of ( mammalian homeostasis ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Mammals)) (VP (VBP attempt) (S (VP (TO to) (VP (VB maintain) (NP (DT a) (JJ comfortable) (NN body) (NN temperature)) (PP (IN under) (NP (JJ various) (NNS conditions))) (PP (IN by) (NP (NP (NN thermoregulation)) (, ,) (NP (NP (NN part)) (PP (IN of) (NP (JJ mammalian) (NNS homeostasis)))))))))) (. .)))
Mammals attempt to maintain a comfortable body temperature under various conditions by thermoregulation, part of mammalian homeostasis.
(ROOT (S (NP (NNP Thermoregulation)) (VP (VBZ is) (NP (NP (DT the) (NN process)) (SBAR (WHNP (WHADVP (WRB when)) (NNS animals)) (S (VP (VBP maintain) (NP (DT an) (JJ internal) (NN temperature))))))) (. .)))