No. There are many aquatic mammals.
yes
They are just called land mammals, or perhaps terrestrial mammals.
Terrestrial placental mammals do have fur or hair. Marine placental mammals do not.
mammals
Both birds and mammals are warm-blooded terrestrial vertebrates.
By the tracheal system.
Both. If your referring to mammals the answer is still both.
G. B. Corbet has written: 'Finding and identifying mammals' -- subject(s): Mammals, Observers' manuals 'The terrestrial mammals of Western Europe'
Like all terrestrial mammals, honey possums have four limbs.
Most terrestrial mammals have fur or hair and feed milk to their young.
Primates are not 'similar' to mammals, they ARE mammals.