Question:
Struggle for existence and survival of the fittest theories were given by
Struggle for existence and survival of the fittest theories were given by
Updated On: Jul 2, 2022
- Wallace
- Darwin
- Lamarck
- none of these
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The Correct Option is D
Solution and Explanation
In the struggle for existence, only those individuals survive which possess the most useful variations. This has been called survival of the fittest by Spencer and natural selection by Darwin.
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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.