( ( Major topics ) ( ( include ( levels ( of ( ( ( ( ( ( ( ( ( ( ( organization , ) integument ) , ) ( skeletal system ) ) , ) ( muscular system ) ) , ) ( nervous system ) ) , ) and ) ( endocrine system ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Major) (NNS topics)) (VP (VBP include) (NP (NP (NNS levels)) (PP (IN of) (NP (NP (NN organization)) (, ,) (NP (NN integument)) (, ,) (NP (JJ skeletal) (NN system)) (, ,) (NP (JJ muscular) (NN system)) (, ,) (NP (JJ nervous) (NN system)) (, ,) (CC and) (NP (JJ endocrine) (NN system)))))) (. .)))
Major topics include levels of organization, integument, skeletal system, muscular system, nervous system, and endocrine system.
(ROOT (S (ADVP (RB Together)) (, ,) (NP (DT the) (JJ muscular) (CC and) (JJ skeletal) (NNS organs)) (VP (VBP are) (VP (VBN known) (PP (IN as) (NP (DT the) (JJ musculoskeletal) (NN system))))) (. .)))
Together, the muscular and skeletal organs are known as the musculoskeletal system.