To add: Life’s history, DNA evidence, Fossil evidence to Pull It Together concept map. Concept introduction: Scientists study the history of life in the context of the geologic timescale that divides time into various eons, eras, period and epoch. The Earth formed around 4.6 billion years ago and was very hot at that time. It slowly cooled down to form Earth crust around 4.1 billion years ago. The origin of life became possible only after that. The various events that occurred after the origin of life can be studied through fossil records and molecular data.

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Chapter 15, Problem 1PIT

Summary Introduction

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Life’s history, DNA evidence, Fossil evidence to Pull It Together concept map.

Concept introduction:

Scientists study the history of life in the context of the geologic timescale that divides time into various eons, eras, period and epoch. The Earth formed around 4.6 billion years ago and was very hot at that time. It slowly cooled down to form Earth crust around 4.1 billion years ago. The origin of life became possible only after that. The various events that occurred after the origin of life can be studied through fossil records and molecular data.

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