<span>The bottleneck effect is the cause of the sudden shift in the genetic information of the population. Due to the landslide, suddenly high number of the members of the main population died, and this caused genetic drift for reducing the variation in the existing generation, which is now widely different from the original one.</span><span />
<span>surface faulting moves the ground in different directions</span>
Planaria lives in freshwater and have eyespots
earthworm live in soil have mouth and anus and they have no eyes
Louis Pasteur proved it in the middle of the eighteenth century
