Most amphibians have characteristics that include four legs, moist skin without scales, lungs, and a double-loop circulatory system.
a. true
b. false

True

Explanation:

Amphibians are the animals that spend their life partially in water and partially on land. They are cold blooded animals that cannot regulate their body temperature.

Some of the characteristic feature of amphibians are:

They have a moist skin but do not have scales on their body and gas exchange takes place through their skin.

They have four legs, a double loop circulatory system, aquatic larvae.

Example: Toad, salamander, et cetera.

answer: all : )

explanation:

trachea, alveoli, lung capillaries, arteries