Question

The common thing in fish, amphibians, and reptiles is
A. Scales
B. Ovipary
C. Shelled eggs
D. Gills

Answer 1

Hint: Fishes and reptiles have scales in their body, but amphibians do not have scales in their body. They have moist skin but reptiles have dry skin.

Complete answer: Ovipary is a method of reproduction by which eggs are laid by animals though the embryo development takes place outside the mother’s womb.
In this case, all the three vertebrates that mean fishes, amphibians, and reptiles lay eggs and embryo development is seen outside the mother’s body.
So, fishes, amphibians, and reptiles are Ovipary.
Shelled eggs are seen in the case of reptilians but fishes or amphibians do not give shelled eggs.
During the larval stage, the amphibian respiratory organ is gills but as metamorphosis occurs, gills disappear and finally, an adult amphibian respires with lungs. In the case of reptiles, they have only one respiratory organ from birth and that is lungs.

Hence, option B. is correct for this question.

Note: The respiratory organ of fish is gills.
Amphibians have two respiratory organs – one seen in the larval stage and the other seen in the adult stage.