Life Began On the Earth Around 3500 Million Years Ago
Though life began on the earth around 3500 million years ago, it was confined to plants and animals for many millennia. Humans appeared on the earth in pre-Pleistocene and early Pleistocene times. Several types of humans, called hominids, lived in southern and eastern Africa about 6 million years ago. The earth is over 4600 million years old. The evolution of [...]