( ( Fitness ( in ( this ( biological sense ) ) ) ) ( ( relates ( to ( ( the ability ) ( of ( an ( animal ( to ( ( ( survive and ) raise ) young ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNP Fitness)) (PP (IN in) (NP (DT this) (JJ biological) (NN sense)))) (VP (VBZ relates) (PP (TO to) (NP (NP (DT the) (NN ability)) (PP (IN of) (NP (DT an) (NN animal) (S (VP (TO to) (VP (VB survive) (CC and) (VB raise) (NP (JJ young)))))))))) (. .)))
Fitness in this biological sense relates to the ability of an animal to survive and raise young.
(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))))))))) (. .)))