Two characteristics of amphibian animals​

Amphibians are cold-blooded animals, meaning they do not have a constant body temperature but instead take on the temperature of their environment. They have moist, scaleless skin that absorbs water and oxygen, but that also makes them vulnerable to dehydration (loss of bodily fluids).

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Amphibians are cold-blooded which means they rely on the temperature of the environment that they are in. Amphibians also have a complex life cycle (e.g. egg --> tadpole ---> tadpole with legs --> frog).

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this age may represent the age of the earth's accretion, of core formation, or of the material from which the earth formed. this dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.