LIFE SCIENCE

Detailed explanation-1: -The Precambrian is so named because it preceded the Cambrian, the first period of the Phanerozoic Eon, which is named after Cambria, the Latinised name for Wales, where rocks from this age were first studied. The Precambrian accounts for 88% of the Earth’s geologic time.

Detailed explanation-2: -The early, Precambrian continents were unlike those we know today: they were smaller and had surfaces of igneous rocks. No life lived upon them.