( ( Chondro refersto ) ( ( cartilage ( because ( ( these guys ) ( have ( ( almost ( entirely cartilaginousinternal ) ) skeletons ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Chondro) (NNP refersto)) (VP (VBZ cartilage) (SBAR (IN because) (S (NP (DT these) (NNS guys)) (VP (VBP have) (NP (ADJP (RB almost) (RB entirely) (JJ cartilaginousinternal)) (NNS skeletons)))))) (. .)))
Chondro refersto cartilage because these guys have almost entirely cartilaginousinternal skeletons.
(ROOT (S (ADVP (RB Early) (PP (IN in) (NP (NP (DT the) (NN development)) (PP (IN of) (NP (DT a) (JJ human) (NN fetus)))))) (, ,) (NP (DT the) (NN skeleton)) (VP (VBZ is) (VP (VBN made) (ADVP (RB entirely)) (PP (IN of) (NP (NN cartilage))))) (. .)))