What causes a change in species?

Answer 1

The simplest method would be geographic separation of the species, allopactric speciation. The local population of this species is split asunder by some geographic barrier; perhaps a large number of the species, about half, cross a river and take up new territory there. Then the similar population gene pools start to draw apart as different mutations to the DNA and different selection pressures in the new environment shape the across the river species into a new species over time. Long enough and the two split species can not longer, or do not want to, interbreed.

This is how bonobos became a new species from common chimpanzees.

Answer 2

A change in species can be caused by various factors such as environmental pressure, genetic mutations, natural selection, and geographic isolation. These factors can lead to the evolution of new traits and adaptations, ultimately resulting in the formation of a new species over generations.

Answer 3

A change in species happens when animals of the same species get separated by natural cause or by humans and they have to adapt and develop mutations to cope with a different envvironment.

Answer 4

This would include weather conditions, "survival of the fittest", or shortage of food/water supply and/or loss of shelter.