( ( ( ( ( If , ) ( on ( the ( other hand ) ) ) ) , ) ( ( a ( particular ( living being ) ) ) ( is ( a ( sexual being ) ) ) ) ) ( , ( then ( it ( ( does ( belong ( to ( ( a species ) ( which ( reproduces ( ( ( ( sexually or ) also ) sexually ) ( , ( ( altho ( it ( ( may not ) ( be ( ( able ( -LRB- ( anymore -RRB- ) ) ) ( to ( ( reproduce itself ) ( in ( this ( ( way and ) altho ) ) ) ) ) ) ) ) ) ) ( it ( ( ( need not ) itself ) ( be ( interested ( in ( sexual matters ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (SBAR (IN If) (, ,) (PP (IN on) (NP (DT the) (JJ other) (NN hand))) (, ,) (S (NP (DT a) (JJ particular) (NN living) (VBG being)) (VP (VBZ is) (NP (DT a) (JJ sexual) (NN being))))) (, ,) (ADVP (RB then)) (NP (PRP it)) (VP (VBZ does) (VP (VB belong) (PP (TO to) (NP (NP (DT a) (NN species)) (SBAR (WHNP (WDT which)) (S (VP (VBZ reproduces) (SBAR (S (FRAG (ADVP (ADVP (RB sexually)) (CC or) (ADVP (RB also))) (ADVP (RB sexually))) (, ,) (NP (NP (NN altho)) (SBAR (S (NP (PRP it)) (VP (MD may) (RB not) (VP (VB be) (ADJP (JJ able) (PRN (-LRB- -LRB-) (ADVP (RB anymore)) (-RRB- -RRB-)) (S (VP (TO to) (VP (VB reproduce) (NP (PRP itself)) (PP (IN in) (NP (DT this) (NN way) (CC and) (NN altho)))))))))))) (NP (PRP it)) (VP (MD need) (RB not) (NP (PRP itself)) (VP (VB be) (ADJP (JJ interested) (PP (IN in) (NP (JJ sexual) (NNS matters))))))))))))))) (. .)))
If, on the other hand, a particular living being is a sexual being, then it does belong to a species which reproduces sexually or also sexually, altho it may not be able (anymore) to reproduce itself in this way and altho it need not itself be interested in sexual matters.
(ROOT (S (NP (NNS Vertebrates)) (VP (VB reproduce) (ADVP (RB sexually))) (. .)))