Final answer:
Sahelanthropus tchadensis is the fossil that is considered the missing-link between humans and apes due to its similarity to the last common ancestor of humans and chimpanzees. It had a small cranial capacity and other anatomical features that indicate it was not bipedal.
Step-by-step explanation:
The fossil that is hailed as the missing-link between humans and apes is Sahelanthropus tchadensis. This fossil ape lived approximately 7 MYA and is claimed by some researchers to be the last common ancestor of humans and chimpanzees. Sahelanthropus had a small cranial capacity, similar to that of a chimpanzee, and other skeletal features that suggest it was not bipedal.