Which of the following statement is incorrect?

Question:Which of the following statement is incorrect?

1.Aves are warm blooded, egg laying and have four four-chambered heart.

2.Aves have feather covered body, fore limbs are modified as wing and breathe through lungs.

3.Most of the mammals are viviparous.

4.Fishes, amphibians and reptiles are oviparous.

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