( However ( , ( there ( ( ( ( ( is ( ( no evidence ) at ) ) ( present ( to ( substantiate ( a ( biologic theory ) ) ) ) ) ) , ) ( just ( as ( there ( is ( no ( compelling ( evidence ( to ( support ( any ( singular ( psychological explanation ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB However)) (, ,) (NP (EX there)) (VP (VBZ is) (ADVP (NP (DT no) (NN evidence)) (IN at)) (ADJP (JJ present) (S (VP (TO to) (VP (VB substantiate) (NP (DT a) (JJ biologic) (NN theory)))))) (, ,) (SBAR (RB just) (IN as) (S (NP (EX there)) (VP (VBZ is) (NP (DT no) (JJ compelling) (NN evidence) (S (VP (TO to) (VP (VB support) (NP (DT any) (JJ singular) (JJ psychological) (NN explanation)))))))))) (. .)))
However, there is no evidence at present to substantiate a biologic theory, just as there is no compelling evidence to support any singular psychological explanation.
(ROOT (S (NP (DT A) (NN theory)) (VP (VBZ is) (NP (NP (DT another) (NN name)) (PP (IN for) (NP (NP (DT a) (JJ broad) (NN explanation)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN supported) (PP (IN by) (NP (NP (DT a) (JJ great) (NN deal)) (PP (IN of) (NP (NN evidence))))))))))))) (. .)))