( ( An ( easy ( way ( to ( remember ( ( the ( six ( most ( essential elements ) ) ) ) ( in ( living organisms ) ) ) ) ) ) ) ) ( ( is ( CHONPC ( -LRB- ( ( ( carbon , ) ( hydrogen ( , ( oxygen ( , ( nitrogen ( , ( phosphorus ( , ( and calcium ) ) ) ) ) ) ) ) ) ) -RRB- ) ) ) ) . ) )
(ROOT (S (NP (DT An) (JJ easy) (NN way) (S (VP (TO to) (VP (VB remember) (NP (NP (DT the) (CD six) (JJS most) (JJ essential) (NNS elements)) (PP (IN in) (NP (VBG living) (NNS organisms)))))))) (VP (VBZ is) (NP (NP (NNP CHONPC)) (PRN (-LRB- -LRB-) (NP (NP (NN carbon)) (, ,) (NP (NN hydrogen) (, ,) (NN oxygen) (, ,) (NN nitrogen) (, ,) (NN phosphorus) (, ,) (CC and) (NN calcium))) (-RRB- -RRB-)))) (. .)))
An easy way to remember the six most essential elements in living organisms is CHONPC (carbon, hydrogen, oxygen, nitrogen, phosphorus, and calcium).
(ROOT (S (NP (NP (NNP Carbon)) (PRN (-LRB- -LRB-) (X (SYM c)) (-RRB- -RRB-))) (VP (VBZ is) (ADJP (JJ essential) (PP (TO to) (S (VP (VBG living) (NP (NNS organisms)) (PP (IN because) (NP (NP (NN carbon) (NNS bonds)) (PP (IN in) (NP (JJ many) (NNS ways))))) (PP (IN with) (NP (PRP itself))) (S (VP (TO to) (VP (VB form) (NP (NNS chains)))))))))) (. .)))
Carbon (c) is essential to living organisms because carbon bonds in many ways with itself to form chains.