( ( ( Give reasons ) ( for ( ( the ( five ( mass extinctions ) ) ) ( in ( ( the history ) ( of life ) ) ) ) ) ) . )
(ROOT (S (VP (VB Give) (NP (NNS reasons)) (PP (IN for) (NP (NP (DT the) (CD five) (JJ mass) (NNS extinctions)) (PP (IN in) (NP (NP (DT the) (NN history)) (PP (IN of) (NP (NN life)))))))) (. .)))
Give reasons for the five mass extinctions in the history of life.
(ROOT (S (NP (CD Five) (JJ mass) (NNS distinctions)) (VP (VBP have) (ADVP (RB radically)) (VP (VBN altered) (NP (NP (DT the) (NN history)) (PP (IN of) (NP (NN life)))))) (. .)))