You only sent a graph, you need to include the question for us in order to answer.
The evolution of the peppered moth evolutionary instance of directional colour change in the moth population as a consequence of air pollution during the Industrial revolution .The frequency of dark-coloured moths increased at that time, an example of industrial mellaniam. Later, when pollution was reduced, the light-coloured form again predominated. Industrial melanism in the peppered moth was an early test of Charles Darwin natural selection in action, and remains as a classic example in the teaching of evolution.
Larger sediments get dropped into steep areas
some keep flowing
Well one is independent segregation of maternal and paternal chromosomes and another is crossing over
