( 12 ( ( Extracellular digestion ) ( in ( a ( gastrovascular cavity ) ) ) ) )
(ROOT (NP (NP (CD 12)) (NP (NP (NNP Extracellular) (NNP digestion)) (PP (IN in) (NP (DT a) (NN gastrovascular) (NN cavity))))))
12 Extracellular digestion in a gastrovascular cavity
(ROOT (S (NP (NNP Digestion)) (VP (VBZ begins) (PP (IN in) (NP (DT the) (NN gastrovascular) (NN cavity)))) (. .)))