Question on: JAMB Biology - 2017

The possession of scales, laying of eggs with shells and bony structure of the head are characteristics shared by

birds and reptiles

fishes and birds

reptiles and fishes

birds and molluscs

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Correct Option: A

Its long been recognized that birds and reptiles share many characteristics:

Both have skulls that abut the first neck vertebra with a single ball-and-socket joint.

Both birds and reptiles excrete nitrogenous wastes as uric acid; mammals excrete urea, fish ammonia.

Both lay similar highly yolked eggs

Bird feather is homologous to the reptile scale. Both develop from an epidermal elevation over a nourishing dermal core. Scales flatten, feather buds roll into a cylinder shaped tube