( ( 18.7 Observe ) ( ( protists ( in ( the laboratory ) ) ) . ) )
(ROOT (S (NP (NNP 18.7) (NNP Observe)) (VP (VBZ protists) (PP (IN in) (NP (DT the) (NN laboratory)))) (. .)))
18.7 Observe protists in the laboratory.
(ROOT (S (NP (JJ Multiple) (NN fission)) (VP (VBZ is) (ADVP (RBR more) (RB often)) (VP (VBN observed) (PP (IN among) (NP (NNS protists))))) (. .)))