( ( Describe ( ( life cycles ) ( of organisms ) ) ) . )
(ROOT (S (VP (VB Describe) (NP (NP (NN life) (NNS cycles)) (PP (IN of) (NP (NNS organisms))))) (. .)))
Describe life cycles of organisms.
(ROOT (S (NP (NNP Life) (NN cycle)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (DT the) (NN span)) (PP (IN in) (NP (NP (DT the) (NN life)) (PP (IN of) (NP (NP (DT an) (NN organism)) (PP (IN from) (NP (NP (CD one) (NN generation)) (PP (TO to) (NP (DT the) (JJ next))))))))))))) (. .)))