"Scientists had been searching for just such a common genealogical link and have found it in a lowly occupant of the fossil record, Protungulatum donnae, that until now has been so obscure that it lacks a colloquial nickname. But as researchers reported Thursday in the journal Science, the animal had several anatomical characteristics for live births that anticipated all placental mammals and led to some 5,400 living species, from shrews to elephants, bats to whales, cats to dogs and, not least, humans."
Notice, Brenda, how many species had the same common ancestor? 5400! All of them, mammals.
You see, scientists and doctors cannot deny that humans are mammals... common sense, as you say.
They also can't deny the evidence of evolution and finds like this one that only serve to support evolution and common ancestors like the 'Protungulatum donnae' ... common sense, as you say.