Question

how speciation and natural selection leads to evolution? ​

Answer 1

Natural selection means the selection of favourable traits in organisms by nature, in more simpler words the traits which organisms develop due to various genetic changes and which somehow help them to survive better in that particular environment are passed on to the next generations with the survival of the organism.

Natural selection is a major driving force for speciation. Through natural selection new traits are selected which get accumulated gradually and ultimately form new individuals which are not sexually compatible with the other organisms of the species from which they are formed, this is now we call them a separate species. In the absence of natural selection the beneficial traits are no longer been selected by nature and we may not be able to see new species. For natural selection to work efficiently many other factors are also responsible which helps in the final achievement of reproductive isolation and formation of a new species.

Answer 2

As the nature selects the fittest and does generation after generation the more fit and varied offspring will be produced.Hence, the evolution takes place.