Final answer:
Several species of hominins evolved between the chimp/human ancestor and modern Homo and Pan, such as Australopithecus, Homo habilis, Homo erectus, Neanderthals, and Denisovans.
Step-by-step explanation:
The intermediate ancestors that lived between the chimp/human ancestor and modern Homo and Pan include several species of hominins. These species evolved after the split of the primate line and are more closely related to humans than to chimpanzees. Some examples of these intermediate ancestors include Australopithecus, Homo habilis, Homo erectus, Neanderthals, and Denisovans.