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Dolphins are placental mammals. All placental mammals have bellybuttons of some kind.
Cats are placental mammals, and all placental mammals have bellybuttons of some sort.
Not by itself. But some people lose their bellybuttons due to surgery b/c of injury or sickness.
Yes, they do eat bellybuttons. It's their favorite food!
As a matter of fact, dolphins do have bellybuttons. All mammals have them because that is where their umbilical cord was connected.
no
Yes.
James baldry
Mammals, yes.
Umm, no ;)
Abnormality in cell growth and the cell cycle leading to cancer
no pigs dont have belly buttons