New Models of Nature & Biology (philosophy + biology)

To what extent can biological concepts and categories be extended to humans? How, specifically, have the biological concepts of the inheritance of acquired characteristics, Malthusian limits, natural selection, and genetic information been used in reference to human behavior and heredity? What are some reasons why thinking of humans in the same way that we think of other animals might be unproductive? In what spheres might thinking of humans as "just another animal` make sense and lead to the progress of knowledge? Historically, what have been some of the results of extending biological concepts and categories to humans?