Question:
The important gas which was absent during the formation of Earth is
The important gas which was absent during the formation of Earth is
Updated On: Jun 17, 2022
- oxygen
- hydrogen
- nitrogen
- carbon dioxide
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The Correct Option is A
Solution and Explanation
The primitive atmosphere of Earth was devoid of oxygen gas. In primitive atmosphere, hydrogen atoms were most numerous and most reactive. They combined with all available oxygen atoms and formed water, which is very important for life.
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Concepts Used:
Evolution
Evolution is a process that occurs in changes in the genetic content of a population over time. Evolutionary change is generally classified into two: microevolution and macroevolution. The process of changes in allele frequencies in a population over time is a microevolutionary process. Three main mechanisms that cause allele frequency change are natural selection, genetic drift, and gene flow. On the other hand, macroevolution refers to change at or above the level of the species.