( ( ( The ( body weight ) ) ( of ( the animal ) ) ) ( probably ( ( contributes ( to ( rotation ( of ( the ( coffin bone ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (NP (DT The) (NN body) (NN weight)) (PP (IN of) (NP (DT the) (NN animal)))) (ADVP (RB probably)) (VP (VBZ contributes) (PP (TO to) (NP (NP (NN rotation)) (PP (IN of) (NP (DT the) (NN coffin) (NN bone)))))) (. .)))
The body weight of the animal probably contributes to rotation of the coffin bone.
(ROOT (S (NP (JJ Medial) (NN rotation)) (VP (VBZ is) (NP (NP (DT the) (NN term)) (PP (IN for) (NP (NP (NN rotation)) (PP (IN of) (NP (NP (DT a) (NN bone)) (PP (IN toward) (NP (NP (DT the) (NN midline)) (PP (IN of) (NP (DT the) (NN body))))))))))) (. .)))