Integrated Science
Integrated Science
7th Edition
ISBN: 9780077862602
Author: Tillery, Bill W.
Publisher: Mcgraw-hill,
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Chapter 21, Problem 1CQ
To determine

The sequence of following events: living cell, oxidizing atmosphere, eukaryotes developed, reducing atmosphere, first organic molecule.

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Answer to Problem 1CQ

The correct sequence of the events that occurred on the Earth is reducing atmosphere, the formation of a first organic molecule, development of living cell, the oxidizing atmosphere on the Earth, and the development of eukaryotes.

Explanation of Solution

The early stages of the Earth showed the presence of reducing atmosphere and reducing gases on the Earth due to the high level of volcanic eruptions, lightning and ultraviolet radiations. With the beginning of photosynthetic organisms, reducing the atmosphere of the earth was changed into the oxidizing atmosphere. After millions of years later, records of the first organic molecules were found. These events followed the development of living cell and conversion of reducing atmosphere into the oxidizing atmosphere. After the oxidizing process, the formation of eukaryotes occurred. Therefore, this is the sequence of occurrence of events that occurred in the life history of the Earth.

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