( ( Internal thermoregulation ) ( ( contributes ( to ( ( animal 's ) ( ability ( to ( ( maintain homeostasis ) ( within ( ( a ( certain range ) ) ( of temperatures ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Internal) (NNP thermoregulation)) (VP (VBZ contributes) (PP (TO to) (NP (NP (NN animal) (POS 's)) (NN ability) (S (VP (TO to) (VP (VB maintain) (NP (NNS homeostasis)) (PP (IN within) (NP (NP (DT a) (JJ certain) (NN range)) (PP (IN of) (NP (NNS temperatures))))))))))) (. .)))
Internal thermoregulation contributes to animal's ability to maintain homeostasis within a certain range of temperatures.
(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))))))) (. .)))