( ( In ( the ( following chapters ) ) ) ( you ( ( will ( learn ( that ( ( ( the energy ) ( used ( by ( all organisms ) ) ) ) ( comes ( from ( ( the sun ) ( -LRB- ( ( which ( is ( ( a portion ) ( of ( ( the energy ) ( ( released ( by ( the ( Big Bang ) ) ) ) ( when ( ( the universe ) ( originated ( ( ( about ( 20 billion ) ) years ) ago ) ) ) ) ) ) ) ) ) ) -RRB- ) ) ) ) ) ) ) ) ) . ) ) )
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In the following chapters you will learn that the energy used by all organisms comes from the sun (which is a portion of the energy released by the Big Bang when the universe originated about 20 billion years ago).
(ROOT (S (PP (IN Over) (NP (NP (CD 90) (NN %)) (PP (IN of) (NP (DT the) (NN energy))))) (NP (PRP we)) (VP (VBP use) (SBAR (S (VP (VBZ comes) (ADVP (RB originally)) (PP (IN from) (NP (DT the) (NN sun))))))) (. .)))