( ( Imagine ( that ( ( ( a species ) ( of fish ) ) ( ( ( used ( to ( be ( ( a ( broadcast spawner ) ) ( -LRB- ( ( producing ( ( many eggs ) ( that ( then ( get ( no ( subsequent ( parental care ) ) ) ) ) ) ) ) -RRB- ) ) ) ) ) ) but ) ( has ( evolved ( to ( be ( ( a ( mouth brooder ) ) ( -LRB- ( ( ( ( ( holding ( ( the eggs ) ( in ( ( the ( parent 's ) ) mouth ) ) ) ) ( until ( they hatch ) ) ) and ) ( then ( caring ( for ( ( the young ) ( for ( a while ) ) ) ) ) ) ) -RRB- ) ) ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Imagine) (SBAR (IN that) (S (NP (NP (DT a) (NN species)) (PP (IN of) (NP (NN fish)))) (VP (VP (VBD used) (S (VP (TO to) (VP (VB be) (NP (NP (DT a) (NN broadcast) (NN spawner)) (PRN (-LRB- -LRB-) (VP (VBG producing) (NP (NP (JJ many) (NNS eggs)) (SBAR (WHNP (WDT that)) (S (ADVP (RB then)) (VP (VBP get) (NP (DT no) (JJ subsequent) (JJ parental) (NN care))))))) (-RRB- -RRB-))))))) (CC but) (VP (VBZ has) (VP (VBN evolved) (S (VP (TO to) (VP (VB be) (NP (NP (DT a) (NN mouth) (NN brooder)) (PRN (-LRB- -LRB-) (VP (VP (VBG holding) (NP (NP (DT the) (NNS eggs)) (PP (IN in) (NP (NP (DT the) (NN parent) (POS 's)) (NN mouth)))) (SBAR (IN until) (S (NP (PRP they)) (VP (VBP hatch))))) (CC and) (VP (ADVP (RB then)) (VBG caring) (PP (IN for) (NP (NP (DT the) (JJ young)) (PP (IN for) (NP (DT a) (NN while))))))) (-RRB- -RRB-)))))))))))) (. .)))
Imagine that a species of fish used to be a broadcast spawner (producing many eggs that then get no subsequent parental care) but has evolved to be a mouth brooder (holding the eggs in the parent's mouth until they hatch and then caring for the young for a while).
(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)))))) (. .)))