Colibri:
Is spelling it “opposum” supposed to indicate what an independent thinker you are? Fight the Power!
Your position is quite obviously not based on an objective evaluation of the evidence (especially since you don’t appear to know much about the actual evidence). As I said, it is very much an artifact of outmoded nineteenth century evolutionary views, in which there was a linear progression from lower to higher forms. Marsupials were regarded as a sort of “half-mammal” that hadn’t quite made the grade compared to the “true mammals,” the placentals. This is reflected in the names given to the groups by Thomas Huxley in 1880, the Metatheria (“almost-beasts”) and the Eutheria (“good-beasts”).
It was assumed that marsupials represented an evolutionary stage in the progression to placentals, and that placentals had marsupial or marsupial-like ancestors. In fact, fossil evidence has shown that the two groups are of similar antiquity, and that one did not evolve from the other.
Far from showing you are “enlightend,” your opinion just shows that you are stuck in a mode of evolutionary thinking that has been obsolete for decades.
Trust me, I know about evolution way more than you do. And marsupials being inefficient to placentals is not some idealogy, it’s a simple fact. You obviously ignore mountains of evidence in favor of your equalitarian view of the natural world, which I think shows how poor you are as a biologist as you shape your opinions around your ideology.