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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 19, Problem 1CT
Textbook Problem
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Researchers looking for fossils of the earliest life-forms face many hurdles. For example, few sedimentary rocks date back more than 3 billion years. Review what you learned about plate tectonics in Section 16.5. Then, explain why so few remaining samples of these early rocks remain.

Summary Introduction

To explain: The reason why only few remaining samples of these early rocks still remain on the earth.

Concept Introduction: Fossils provide proof that the organisms from the past are not the same as those found today. The progression of the evolution can be studied from fossils. The oldest rocks that were found on earth are around 4 billion years ago. They are metamorphic and have been altered by high pressure and temperatures. As the fossils before 4 billion years ago never exist, it is not able to confirm when the life on earth have arisen.

Explanation of Solution

Sedimentary rocks that dated back three billion years ago would not exist, and this creates problems to those researchers who were looking for the fossils in the early life forms on earth. There are mainly two reasons for this condition.

Firstly, there would not be much to fossils that exist in the early earth to fossilize. The second reason may be due to the plate tectonics. The earth is very good in recycling its crust through the tectonic processes...

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