AP BIOLOGY

Detailed explanation-1: -The Precambrian simply refers to the time interval and all rocks that formed prior to the beginning of the Cambrian Period (base of Phanerozoic Eon) at 541 Ma. The interval with no preserved rock record from the formation of the Earth at 4.567 to ca.

Detailed explanation-2: -The Precambrian (or Pre-Cambrian, sometimes abbreviated pꞒ, or Cryptozoic) is the earliest part of Earth’s history, set before the current Phanerozoic Eon.

Detailed explanation-3: -Precambrian Resources The Precambrian is divided into three eons highlighted below, from youngest to oldest: Hadean, Archean, and Proterozoic.

Detailed explanation-4: -Precambrian time covers the vast bulk of the Earth’s history, starting with the planet’s creation about 4.5 billion years ago and ending with the emergence of complex, multicelled life-forms almost four billion years later.

Detailed explanation-5: -Pre·cam·bri·an (ˌ)prē-ˈkam-brē-ən-ˈkām-: of, relating to, or being the earliest era of geologic history or the corresponding system of rocks that is characterized especially by the appearance of single-celled organisms and is equivalent to the Archean and Proterozoic eons see Geologic Time Table.