Female preference promotes asynchronous sex evolution in proboscideans

What are the cause and innate power for the biological evolution? This is a controversial problem from ancient times to now. The interpretation for the evolutionary process is at an ambiguous phase although the academia admitting the existence of evolution has been at an absolute mainstream status. Neo-Darwinists seem to justify an explanation to this question with genetics and natural selection theory. This point also incurs much opposition. One of the important reasons is: the gene mutation is