Darwin in his Natural Selection Theory did not believe in any role of which one of the following in organic evolution:
- Parasites and predators as natural enemies
- Survival of the fittest
- Struggle for existence
- Discontinuous variations
The Correct Option is D
Solution and Explanation
Darwin primarily focused on continuous variations and gradual changes in traits as a result of natural selection. He proposed that small, incremental variations within populations could lead to the evolution of new species over long periods of time. Discontinuous variations, on the other hand, involve abrupt, distinct changes in traits, and they were not a central part of Darwin's theory of evolution through natural selection.
So, the correct option is (D): Discontinuous variations
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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.