Question

1. Living amphibians include ______.

   	A.	all of these
   	B.	frogs
   	C.	toads
   	D.	newts
   	E.	salamanders

2. ______ fishes are the sharks, the rays and the skates.

	A.	Cartilaginous
	B.	Agnathous or jawless
	C.	Bony
	D.	Freshwater

3. Living amphibians include ______.

	A.	all of these
	B.	frogs
	C.	toads
	D.	newts
	E.	salamanders

Answer 1

Ans. Amphibians are tetrapod vertebrates of the class Amphibia and all are ectothermic. Modern amphibians are all Lissamphibia. They live in various habitats, most of them are arboreal, terrestrial, fossorial, or freshwater aquatic ecosystems. Amphibian species normally start out in the water as larvae, but some species develop behavioural adjustments to circumvent this. The three modern orders of amphibians are Apoda (the caecilians), Anura (the frogs and toads), and Urodela (the salamanders). A newt belongs to Pleurodelinae subfamily of salamander. The terrestrial youth period is known as the Eft. In contrast to other Salamandridae families, newts are semi-aquatic and alternate between aquatic and terrestrial habitats. Not all aquatic salamanders are newt.

So, the answer is:

A. all of these

Ans 2. The Chondrichthyes class includes rays, skates, and sharks, all (Greek, chondro means cartilage, ichthos is meaning fish). Chondrichthyes characteristics include cartilage skeleton, jaws, paired fins, and a pair of nostrils. Elasmobranchii Subclass consists of sharks, rays and skates.

So, the answer is:

A. Cartilaginous

Ans 3. Amphibians are tetrapod vertebrates of the class Amphibia and all are ectothermic. Modern amphibians are all Lissamphibia. They live in various habitats, most of them are arboreal, terrestrial, fossorial, or freshwater aquatic ecosystems. Amphibian species normally start out in the water as larvae, but some species develop behavioural adjustments to circumvent this. The three modern orders of amphibians are Apoda (the caecilians), Anura (the frogs and toads), and Urodela (the salamanders). A newt belongs to Pleurodelinae subfamily of salamander. The terrestrial youth period is known as the Eft. In contrast to other Salamandridae families, newts are semi-aquatic and alternate between aquatic and terrestrial habitats. Not all aquatic salamanders are newt.

So, the answer is:

A. all of these