"the sudden loss of ml of blood in a child is considered life threatening"

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?