Question

Compare classes with different features part II Class Name	Numbers of Heart Cambers	Warm-blooded or Cold-blooded ?	External or Internal Fertilization	Body Covering
Agnatha
Chondrichthyes
Osteichthyes
Amphibia
Reptilia
Aves
Mammalia

Answer 1

	Numbers of Heart Chambers	Warm-blooded or Cold-blooded	External or Internal Fertilization	Body covering
Agnatha	2	cold blooded	external	In modern agnathans, the body is covered in skin, with neither dermal or epidermal scales.
Chondrichthyes	2	cold blooded	external	Chondrichthyans have toothlike scales called dermal denticles or placoid scales. Denticles usually provide protection, and in most cases, streamlining.
Osteichthyes	2	cold blooded	external	All have gills covered with a bony operculum, and a layer of thin overlapping bony scales cover the entire body surface.
Amphibia	3	cold blooded	external	Amphibians do not have scales, feathers, or even hair like other animals. Since it does not have that protective covering, the skin of an amphibian can easily dry out.
Reptilia	3	cold blooded	external	Reptilians have epidermal scales covering part or all of their body.
Aves	4	warm-blooded	external	Their bodies are covered with feathers and whose forelimbs are modified into wings. Most can fly.
Mammals	4	warm-blooded	internal	Mammals have hair or fur, birds have feathers, reptiles have dry scales, amphibians have soft, moist skin, and fish have wet, slimy scales.