Answer
Mammals have most of the same adaptations to life on land as any other terrestrial animal, including air-breathing respiratory systems and kidneys. Mammals uniquely have fur, which helps them to protect against the variable elements of life on land.
Work Step by Step
Speaking of uniquely mammalian adaptations, fur is energy-conserving as it takes considerable energy to heat the body. Preventing the loss of heat limits energy lost to thermoregulation.
