( ( Most pathogens ) ( ( are ( killed ( at ( lower temperatures ) ) ) ) . ) )
(ROOT (S (NP (JJS Most) (NNS pathogens)) (VP (VBP are) (VP (VBN killed) (PP (IN at) (NP (JJR lower) (NNS temperatures))))) (. .)))
Most pathogens are killed at lower temperatures.
(ROOT (S (NP (NNP Water)) (VP (MD can) (VP (VB be) (VP (VBN boiled) (S (VP (TO to) (VP (VB kill) (NP (NP (NN giardia)) (CC and) (NP (RBS most) (JJ other) (NNS pathogens))))))))) (. .)))