The earth is very old and organisms change steadily throughout history of life. All organisms are descendants of a common ancestor. Life arose only once on earth. Species multiply by splitting into daughter species. Evolution proceeds with gradual changes in populations.
Natural selection is a major agent in natural selection.
B. Natural selection is the different contribution of offspring to the next generation by various genetic types belonging to the same generations. The importance of a World View A. A paradigm is a general framework within which some scientific discipline is viewed and within which questions are asked and hypothesis are developed.