Mammals are the only animals that are able to produce the nourishment to sustain their young from their own bodies. Provide three evolutionary advantages of this ability and three possible disadvantages.

You find a fossil that you are sure shows evidence of bipedalism. you know this because which of the following anatomical traits is present? a. thighbones that angle in toward the knees b. a narrow pelvis c. opposable hallux d. posterior position of the foramen magnum