( ( The ( fossil record ) ) ( ( shows ( ( ( ( at least ) five ) ( major ( mass extinctions ) ) ) ( have ( ( occurred ( since ( ( the beginning ) ( of life ) ) ) ) ( on earth ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (JJ fossil) (NN record)) (VP (VBZ shows) (SBAR (S (NP (QP (IN at) (JJS least) (CD five)) (JJ major) (NN mass) (NNS extinctions)) (VP (VBP have) (VP (VBN occurred) (PP (IN since) (NP (NP (DT the) (NN beginning)) (PP (IN of) (NP (NN life))))) (PP (IN on) (NP (NN earth)))))))) (. .)))
The fossil record shows at least five major mass extinctions have occurred since the beginning of life on earth.
(ROOT (S (NP (EX There)) (VP (VBP have) (VP (VBN been) (NP (CD five) (JJ major) (JJ massive) (NNS extinctions)) (SBAR (IN since) (S (NP (NN life)) (VP (VBD began) (PP (IN on) (NP (NN earth)))))))) (. .)))