Final answer:
Sahelanthropus tchadensis is a species of fossil ape believed by some researchers to be the last common ancestor of humans and chimpanzees.
Step-by-step explanation:
The name "Sahelanthropus tchadensis" refers to a species of fossil ape that lived around 7 million years ago. This species is believed by some researchers to be the last common ancestor of humans and chimpanzees. The name itself is derived from the Sahel region of Africa where the fossil was discovered, and the word "tchadensis" refers to Chad, the country in which the fossil was found.