What is an amphibian?

Amphibians are a cold blooded vertebrate animal of a class comprises of frogs, toads, and salamanders. They have aquatic gill breathing larval stage follow by a terrestrial lung breathing adult stage.

a cold-blooded vertebrate animal of a class that comprises the frogs, toads, newts, and salamanders and they have gills and eventually breath through their lungs when an adult.

Explanation:

the only liquid elements at standard temperature and pressure are bromine (br) and mercury (hg). although, elements caesium (cs), rubidium (rb), francium (fr) and gallium (ga) become liquid at or just above room temperature.

explanation:

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