What are differences between the following :
(a) Cartilaginous fishes and bony fishes;

(b) Amphibia and Reptilia ;

(c) Aves and mammals.

Question

What are differences between the following :(a) Cartilaginous fishes and bony fishes;(b) Amphibia and Reptilia ;(c) Aves and mammals.

Philoid · Accepted Answer

(a) differences between Cartilaginous fishes and bony fishes:

Cartilaginous fishes	Bony fishes
They are marine Cartilaginous animals.	They are both marine and freshwater animals.
They have cartilaginous endoskeleton	They have bony endoskeleton.
Skin is covered with placoid scales.	Skin is covered with cycloid/ctenoid scales.

(b) differences between Amphibia and Reptila:

Amphibia	Reptilia
Skin is moist and slimy.	Skin is dry and covered by scales of scute plates.
Respiration is either through gills or lungs.	Respiration through lungs.
They lay eggs inside the water.	They lay eggs outside the water.

(c) differences between Aves and mammals:

Aves	Mammals
Body is covered with feathers.	Body is covered with hairs.
Bones are hollow with air cavity for flying.	Bone is not hollow.
They are oviparous.	They are viviparous with few exceptions