How does reproductive isolation result in speciation

Speciation is the adaptive divergence and gradual that leads to two different species.

Reproductive isolation results in speciation when the processes of evolutionary mechanisms, physiological and behaviours are collected.

Mechanism of reproductive isolation helps in preventing members of different species from producing offsprings. A zoologist is a classified way of reproductive isolation whereby it(zoologist) is classified to the mechanism of reproductive isolation into two categories

(i)                  Pre-zygotic. This one acts before fertilization or before mating when it comes to animals.

(ii)                Post-zygotic. It acts after fertilization.

The mechanisms appear I species which are genetically controlled and whose geographic distribution overlaps or are separated.

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.