Why does the discovery of Lucy and Ardi make many scientists think that humans started in Africa?

The discovery of Lucy (Australopithecus afarensis) and Ardi (Ardipithecus ramidus) provides crucial evidence for the theory that human evolution began in Africa. Both fossils date back several million years and exhibit a mix of human-like and ape-like traits, suggesting a common ancestor for humans and other primates. Their discovery in East Africa aligns with genetic and archaeological evidence, reinforcing the idea that early hominins evolved in this region before migrating to other parts of the world. This supports the "Out of Africa" model of human evolution.