( Thermoregulation ( ( is ( ( a ( survival trick ) ) ( that ( helps ( humans ( to ( maintain ( a ( constant ( body temperature ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Thermoregulation)) (VP (VBZ is) (NP (NP (DT a) (NN survival) (NN trick)) (SBAR (WHNP (WDT that)) (S (VP (VBZ helps) (S (NP (NNS humans)) (VP (TO to) (VP (VB maintain) (NP (DT a) (JJ constant) (NN body) (NN temperature)))))))))) (. .)))
Thermoregulation is a survival trick that helps humans to maintain a constant body temperature.
(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))))))) (. .)))