I have one final question for Richard. There are three criteria that distinguish humans from apes anatomically. And as is well known, australopithecines are quite humanlike in this respect. Human feet are flat for walking upright. Ape teeth are characteristically different from human teeth.
Ape teeth are indeed different from human teeth.
The earlier A. afarensis is much more apelike than africanus, but has some human characterics. These are the important criteria. I fail to see why. Both of these characteristics are quite different in humans and apes and hence are as good diagnostic features as your first three points. Few humans are smaller than 900 cc.