on trees. They retained characteristics Hominoids are different from monkeys in a number of ways. They have a larger body and do not have a tail. Besides, there is a longer period of infant development and dependency amongst hominoids.
This is a view of the Olduvai Gorge in the Rift Valley, East Africa (see Map 1b, p. ), one of the areas from which traces of early human history have been recovered. Notice the different levels of earth at the centre of the photograph. Each of these represents a distinct geological phase.
A C B F ROM T HE B EGINNING O F T IME T HEMES IN W ORLD H ISTORY (such as long forelimbs, curved hand and foot bones and mobile ankle joints) suited to life on trees. Over time, as tool making and long- distance walking increased, many human characteristics also developed. The Discovery of Australopithecus, Olduvai Gorge,