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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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Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 19, Problem 14SQ
Textbook Problem
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Which of the following events did NOT occur during the Precambrian?

  1. a. Formation of the ozone layer
  2. b. RNA world
  3. c. Evolution of the first animals
  4. d. Evolution of the first plants.

Summary Introduction

Concept introduction: Precambrian is the earliest part of the Earth’s history that extends from about 4.6 billion years ago to the starting of the Cambrian period, 541 million years ago.

The Precambrian has been divided into three eons: the Hadean, the Archean, and the Proterozoic.

Explanation of Solution

Reasons for correct statement:

The addition of the oxygen present in the atmosphere led to the formation of ozone layer in the atmosphere. It occurs around 2.5 billion years ago.

Option a. is given as “Formation of the ozone layer”. As the ozone layer formation does not occur in the Precambrian Eon, option a. is correct.

Reasons for the incorrect statements:

Option b. is given as “RNA world”.

The evidence that shows RNA was the first genetic material was evolved in the Hadean Eon of the Precambrian period...

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