( ( A turtle ) ( ( s ( shell ( ( is actually ) ( ( made up ) ( of ( ( its ribs ) ( ( ( joined together ) and ) ( covered ( with ( ( a ( thin layer ) ) ( of skin ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN turtle)) (VP (VBZ s) (NP (NP (NN shell)) (SBAR (S (VP (VBZ is) (ADVP (RB actually)) (VP (VBN made) (PRT (RP up)) (PP (IN of) (NP (NP (PRP$ its) (NNS ribs)) (VP (VP (VBN joined) (ADVP (RB together))) (CC and) (VP (VBN covered) (PP (IN with) (NP (NP (DT a) (JJ thin) (NN layer)) (PP (IN of) (NP (NN skin))))))))))))))) (. .)))
A turtle s shell is actually made up of its ribs joined together and covered with a thin layer of skin.
(ROOT (S (NP (JJS Most) (NN turtle) (NNS bodies)) (VP (VBP are) (VP (VBN covered) (PP (IN by) (NP (NP (DT a) (JJ special) (NN bony) (CC or) (NNS cartilaginous) (NN shell)) (VP (VBN developed) (PP (IN from) (NP (PRP$ their) (NNS ribs)))))))) (. .)))