The answer is the span of time from Earth's formation to the start of the Cambrian period. It is the period of time that extends from about 4.6 billion years ago; a point when the earth formation began, to the beginning of the Cambrian period, 541 million years ago. It represents more than 805 of the geologic record.
Homeostasis is the process by which organisms keep internal conditions relatively constant<span> despite changes in external environments. Homeostasis in the body is maintained by feedback loops.
