They traded in there fins for some new legs that allowed them to move around on land.
The main nitrogenous waste excreted by terrestrial amphibians and mammals is urea. Urea is less toxic than ammonia, allowing these animals to conserve water while efficiently eliminating nitrogenous waste. This adaptation is particularly important for survival in terrestrial environments where water conservation is crucial.
No. There are many aquatic mammals.
yes
Terrestrial placental mammals do have fur or hair. Marine placental mammals do not.
They are just called land mammals, or perhaps terrestrial mammals.
mammals
Both birds and mammals are warm-blooded terrestrial vertebrates.
it depends of which speific mammals that you are talking about
The mammals known for their unique adaptations to survive in terrestrial habitats and cannot swim are kangaroos and koalas.
By the tracheal system.
Kangaroos are primitive mammals. There offsprings needs more protection. So they have pouch to keep there babies safe. They are only found in Australia. Incidentally the link between birds and mammals is found in Australia only in the form of echidna and platypus.
None of them...they all are examples of adaptation.