( There ( ( have ( been ( ( five ( mass extinctions ) ) ( in ( ( Earth 's ) history ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP have) (VP (VBN been) (NP (NP (CD five) (JJ mass) (NNS extinctions)) (PP (IN in) (NP (NP (NNP Earth) (POS 's)) (NN history)))))) (. .)))
There have been five mass extinctions in Earth's  history.
(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)))))) (. .)))