( Then ( ( ( a shift ) ( of ( the wind ) ) ) ( ( ( changed ( the temperature ) ) again ) . ) ) )
(ROOT (S (ADVP (RB Then)) (NP (NP (DT a) (NN shift)) (PP (IN of) (NP (DT the) (NN wind)))) (VP (VBD changed) (NP (DT the) (NN temperature)) (ADVP (RB again))) (. .)))
Then a shift of the wind changed the temperature again.
(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))))))))) (. .)))