Class Mammalia vs. Class Amphibia
Mammalia
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| Male rat (Mammalia) and male bullfrog (Amphibia). |
Thermoregulation - hair, sweat glands.
Mammary glands - produce milk.
Viviparous development - retained within body of female to keep warm.
Nourishment - blood vessels through placenta (allows exchange of nutrients and wastes).
Amphibia
Metamorphosis - aquatic and terrestrial life.
Lack of amniotic sac - lay eggs in moist environments.
Ectothermic (cold-blooded) - body temperature regulated by external environment.
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