What characteristics were indicative of members of the genus australopithecus? small brain, small teeth, at least some bipedal ability large brain, small teeth, at least some bipedal ability large brain, large teeth, at least some bipedal ability small brain, large teeth, at least some bipedal ability?

small brain, large teeth, at least some bipedal ability

Explanation:

Unlike chimpanzees, australopithecs did not walk on four legs: they were definitely bipedal. The brains of most known Australopithecus species were 35% smaller than Homo sapiens and a skull not significantly larger than a current chimpanzee.

As for size, these animals were small, generally not exceeding 1.2 m in height. The teeth and jaw were also different, much larger and heavier than those of humans.

In summary, we can say that australopithecians had: small brain, large teeth, at least some bipedal ability.