What is the origin of new species?

Answer 1

New species emerge as a result of reproductive isolation between subpopulations followed by continuing divergence at the genetic and behavioural level. This process is called speciation.
Evolution is the gradual process in which already existing species undergoes in order to have a greater chance of survival. Because Natural Selection takes place, random mutations occur in offsprings, and so new characteristics and attributes are formed. These random mutations may occur because they may have a greater chance of survival or because it would benefit them in some way. For example, the giraffe's long neck came about when it found that it needed a way to obtain leaves from the tops of trees. And so, generation by generation, it's neck slowly lengthened until it was able to do so.

Answer 2

New species can originate through a process known as speciation, where a population becomes isolated from the rest of its species and evolves separately, accumulating genetic differences over time. This isolation can occur through geographic barriers, reproductive barriers, or genetic mutations that create reproductive isolation. Over generations, these genetic differences can become significant enough that the isolated population is considered a distinct species.