( ( Thermoregulation Thermoregulation ) ( ( describes ( ( the process ) ( ( by which ) ( animals ( ( modify ( their ( heat balance ) ) ) ( to ( maintain ( stable ( body temperatures ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Thermoregulation) (NNP Thermoregulation)) (VP (VBZ describes) (NP (NP (DT the) (NN process)) (SBAR (WHPP (IN by) (WHNP (WDT which))) (S (NP (NNS animals)) (VP (VB modify) (NP (PRP$ their) (NN heat) (NN balance)) (S (VP (TO to) (VP (VB maintain) (NP (JJ stable) (NN body) (NNS temperatures)))))))))) (. .)))
Thermoregulation Thermoregulation describes the process by which animals modify their heat balance to maintain stable body 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))))))) (. .)))