( ( ( Immortality or ) ( eternal life ) ) ( ( is ( ( ( the idea ) ( of something ) ) ( which ( ( is alive ) ( that ( will ( ( stay alive ) forever ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Immortality)) (CC or) (NP (JJ eternal) (NN life))) (VP (VBZ is) (NP (NP (DT the) (NN idea)) (PP (IN of) (NP (NN something))) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (ADJP (JJ alive)) (SBAR (IN that) (S (VP (MD will) (VP (VB stay) (ADJP (JJ alive)) (ADVP (RB forever))))))))))) (. .)))
Immortality or eternal life is the idea of something which is alive that will stay alive forever.
(ROOT (S (NP (NP (NN Something)) (SBAR (WHNP (WDT that)) (S (VP (VBZ has) (NP (NP (DT all)) (PP (IN of) (NP (NP (DT the) (NNS characteristics)) (PP (IN of) (NP (NN life)))))))))) (VP (VBZ is) (VP (VBN considered) (S (VP (TO to) (VP (VB be) (ADJP (JJ alive))))))) (. .)))