Is there an reason so far to think mammary glands arose more than once in the history of life?
I don't know the evolutionist's response to this. I've seen evolutionists talking about how eyes and other structures can develop numerous times, in numerous ways, in unrelated creatures (recently unrelated, anyway). Mammary glands could undergo the same (random?) re-evolution, time and again, I suppose. One wonders where creation leaves off and allegedly unguided mutation begins in such cases. But as I said, I don't know.
Well, for the eye for example we have Euglena. Remember Euglena, the plant/animal I posted about that had an eye? The one the evolutionists here do not want to talk about? Tell us, did the eye of the Euglena descend from a bird, a man, or a platypus? Or perhaps it was the other way around? The eye of man descended from Euglena through plants and animals which never had eyes. Let's see your double-talk on this, I need a good laugh.