enhanced preservation basic biological drives http://public.wsu.edu/~taflinge/biology.html#survstrat our most basic desires preprogrammed evolutionary drives this biological instinct Self-preservation http://public.wsu.edu/~taflinge/biology.html#survstrat most basic biological drives Self-preservation http://public.wsu.edu/~taflinge/biology.html http://public.wsu.edu... http://public.wsu.edu... biological creature Human nature is difficult to change Self-preservation our most basic biological drives