( They ( ( ( ( ( brood ( their ( fertilized eggs ) ) ) ( for ( ( various proportions ) ( of ( the period ) ) ) ) ) ( from fertilization ) ) ( to hatching ) ) . ) )
(ROOT (S (NP (PRP They)) (VP (VBD brood) (NP (PRP$ their) (VBN fertilized) (NNS eggs)) (PP (IN for) (NP (NP (JJ various) (NNS proportions)) (PP (IN of) (NP (DT the) (NN period))))) (PP (IN from) (NP (NN fertilization))) (PP (TO to) (NP (NN hatching)))) (. .)))
They brood their fertilized eggs for various proportions of the period from fertilization to hatching.
(ROOT (S (S (NP (NP (DT Some) (NN species)) (PP (IN of) (NP (NN fish)))) (VP (VBP carry) (NP (PRP$ their) (VBN fertilized) (NNS eggs)) (PP (IN in) (NP (PRP$ their) (NN mouth))) (SBAR (IN until) (S (NP (PRP they)) (VP (VBP hatch)))))) (: ;) (S (NP (DT this)) (VP (VBZ is) (VP (VBN called) (S (ADJP (NN mouth) (JJ brooding)))))) (. .)))