( ( One ( of ( ( the ( deepest features ) ) ( of ( human psychology ) ) ) ) ) ( ( is ( ( a trait ) ( that ( can ( be ( called reciprocity ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (CD One)) (PP (IN of) (NP (NP (DT the) (JJS deepest) (NNS features)) (PP (IN of) (NP (JJ human) (NN psychology)))))) (VP (VBZ is) (NP (NP (DT a) (NN trait)) (SBAR (WHNP (WDT that)) (S (VP (MD can) (VP (VB be) (VP (VBN called) (NP (NN reciprocity))))))))) (. .)))
One of the deepest features of human psychology is a trait that can be called reciprocity.
(ROOT (S (NP (JJ Inherited) (NNS traits)) (VP (VBP are) (NP (NP (NNS features)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (VP (VBN passed) (PP (IN from) (NP (CD one) (NN generation))) (PP (TO to) (NP (DT the) (JJ next))))))))) (. .)))