( ( 3 . ) ( ( Know ( ( ( ( the ( three ( main categories ) ) ) ( of ( nutrients ( -LRB- ( ( carbohydrates ( , ( ( lipids , ) proteins ) ) ) -RRB- ) ) ) ) ) and ) ( ( their ( major roles ) ) ( in ( the ( human body ) ) ) ) ) ) . ) )
(ROOT (S (LST (LS 3) (. .)) (VP (VB Know) (NP (NP (NP (DT the) (CD three) (JJ main) (NNS categories)) (PP (IN of) (NP (NP (NNS nutrients)) (PRN (-LRB- -LRB-) (NP (NNS carbohydrates) (, ,) (NNS lipids) (, ,) (FW proteins)) (-RRB- -RRB-))))) (CC and) (NP (NP (PRP$ their) (JJ major) (NNS roles)) (PP (IN in) (NP (DT the) (JJ human) (NN body)))))) (. .)))
3. Know the three main categories of nutrients (carbohydrates, lipids, proteins) and their major roles in the human body.
(ROOT (S (NP (NNS Lipids)) (VP (VBP are) (ADJP (JJ available) (PP (TO to) (NP (NP (DT the) (NN body)) (PP (IN from) (NP (CD three) (NNS sources))))))) (. .)))