( ( ( ( Deer ( reproduce sexually ) ) and ) ( there ( is ( internal fertilization ) ) ) ) . )
(ROOT (S (S (NP (NNS Deer)) (VP (VB reproduce) (ADVP (RB sexually)))) (CC and) (S (NP (EX there)) (VP (VBZ is) (NP (JJ internal) (NN fertilization)))) (. .)))
Deer reproduce sexually and there is internal fertilization.
(ROOT (S (NP (NNS Amphibians)) (ADVP (RB sexually)) (VP (VB reproduce) (PP (IN through) (NP (JJ external) (CC or) (JJ internal) (NN fertilization)))) (. .)))