Many mammals have tusks, including elephants, boars, and of course, narwhals.
Mammals.
Yes. They are mammals.
As elephants are mammals, and all mammals are vertabrates (ie. they have a backbone), then yes, they do indeed have a backbone.
Neither. Elephants are placental mammals, which form a different group of mammals from either the marsupials (pouched mammals) or the monotremes (egg-laying mammals).
No, elephants are not marsupials. Elephants are considered placental mammals.
Elephants are mammals and are warm blooded.
No. No males of a species has babies. Elephants are mammals.
Yes
Yes
No elephants are mammals.
Cows, elephants and whales are all mammals.