( ( This ( fitness value ) ) ( ( determines ( ( ( which ( individuals survive ) ) and ) ( ( ( how many ) offspring ) ( they ( will produce ) ) ) ) ) . ) )
(ROOT (S (NP (DT This) (NN fitness) (NN value)) (VP (VBZ determines) (SBAR (SBAR (WHNP (WDT which)) (S (NP (NNS individuals)) (VP (VBP survive)))) (CC and) (SBAR (WHNP (WHADJP (WRB how) (JJ many)) (NNS offspring)) (S (NP (PRP they)) (VP (MD will) (VP (VB produce))))))) (. .)))
This fitness value determines which individuals survive and how many offspring they will produce.
(ROOT (S (NP (DT The) (NN term) (NN fitness)) (VP (VBZ describes) (NP (NP (DT the) (JJ overall) (NN ability)) (PP (IN of) (NP (DT an) (NN animal) (S (VP (TO to) (VP (VB survive) (CC and) (VB produce) (NP (NN offspring))))))))) (. .)))