( ( Left ( of ( the ( gut ( two ( developing embryos ) ) ) ) ) ) ( ( can ( be seen ) ) . ) )
(ROOT (S (NP (NP (NNP Left)) (PP (IN of) (NP (DT the) (NN gut) (CD two) (JJ developing) (NNS embryos)))) (VP (MD can) (VP (VB be) (VP (VBN seen)))) (. .)))
Left of the gut two developing embryos can be seen.
(ROOT (S (NP (NP (NNS Invertebrates)) (-LRB- -LRB-) (CC and) (NP (JJR higher) (NNS animals)) (-RRB- -RRB-)) (VP (MD can) (ADVP (RB also)) (VP (VB be) (VP (VBN placed) (PP (IN in) (NP (NP (CD one)) (PP (IN of) (NP (CD two) (NNS groups))))) (PP (VBN based) (PP (IN on) (SBAR (WHADVP (WRB how)) (S (NP (PRP they)) (VP (VBP develop) (PP (IN as) (NP (NNS embryos))))))))))) (. .)))
Invertebrates (and higher animals) can also be placed in one of two groups based on how they develop as embryos.