Answer:
The central principle of Darwin theory is based on the fact that,
He observed that in a given population,organism usually produced more offspring than than they can naturally capable of taken care of to replace the parents population.And this leads to increase in large population.
Despite this large population the natural population remain stable over a long period of time.
Because in this population organisms compete for needed resources for survival, thus certain organisms with special characteristics or traits were able to for survive better, and therefore get the natural resources, and resist the selection pressure while others which can not, will be removed from the population. Hence there is competitions for the natural resources,
Therefore organisms that survived were better adapted, because they must have inherited the survival traits or genes from their parents. This surviving traits is caused by variation.And is is responsible for their better adaptation and survival in the population.
A s this continues the population of the survived organisms will dominates,This is because these organism are naturally selected by nature, and able to resist the selection pressure.
They are known as the survival of the fittest, and their selection advantages due to variation (caused be mutation) is responsible for their dominating population and natural selection compare to the less selected ones.
Explanation:
