<span>Natural selection leads to speciation because as populations in a species change due to mutations, the less fit organisms die out, while the fit organisms survive and pass on their genes. As this process continues, the evolved population will eventually accumulate enough genetic changes, such that the evolved population can no longer produce fertile offspring with the original population, hence it is said that speciation has occurred. </span>
Best way to to get tested is at a clinic
Get inside and wait it out
Physicians determine preventative care screenings depending upon a persons age.
Okay I will follow right now
