Ans.
-A species may defined as the largest group of organisms, which are similar to each other and show ability to interbreed and produce fertile offspring. Genetic diversity is defined as total number of genetic features in a species' genetic makeup.
-Natural selection results in evolution, when characteristics in organisms of species with greater survival and reproductive rate than other organisms of a population transmit to their offspring. Over many generations, individuals of one species evolve into other species, due to gradual modified characteristics.
-Mutations are defined as permanent, hereditary changes in genetic material or DNA. Change in DNA of an organism over successive generations leads to change in a population's genetic composition that results in evolution.