Answer:
D) The population become adapted to different environments and eventually become so different that they cannot interbreed to produce fertile offspring.
Explanation:
Speciation is divided into three stages:
a) Separation.
b) Adaptation.
c) Reproductive Isolation.
Stage 1: Separation.
A part of the population separates and adapts to a new environment. Natural events such as tsunamis, tidal waves can cause organisms to separate from their initial habitat to a new environment.
Stage 2: Adaptation.
At this stage, the organisms evolve new traits that enable them to the new environment. They possess certain characteristics that enables them to fit into the new environment. Example The great white skin's colour makes it difficult for it to be seen in the dark.
Stage 3: Reproductive Isolation.
At this stage, organisms of the same specie reunites and do not interbreed with each other. Here, species are isolated into new ones so they have the best adaptations for their new habitat.
