( ( ( ( ( They ( have ( do ( ( ( have ( internal fertilization ) ) and ) ( produce ( an ( amniotic egg ) ) ) ) ) ) ) , ) but ) ( they ( do ( nothave ( copulatory organ ) ) ) ) ) . )
(ROOT (S (S (NP (PRP They)) (VP (VBP have) (VP (VBP do) (VP (VP (VB have) (NP (JJ internal) (NN fertilization))) (CC and) (VP (VB produce) (NP (DT an) (JJ amniotic) (NN egg))))))) (, ,) (CC but) (S (NP (PRP they)) (VP (VBP do) (NP (JJ nothave) (NN copulatory) (NN organ)))) (. .)))
They have do have internal fertilization and produce an amniotic egg, but they do nothave copulatory organ.
(ROOT (S (NP (NNS Mammals)) (VP (VP (VBP have) (NP (CD four) (NNS limbs))) (CC and) (VP (VBP produce) (NP (JJ amniotic) (NNS eggs)))) (. .)))