Natural selection, a concept first theorized by Charles Darwin, is the adjustment of genes throughout generations based on factors that help living organisms survive. Sometimes this is survival of the fittest or the adaptation of organisms that are better suited to the environment in other ways.
Personification and anthropomorphism are often confused because both terms have similar meanings. Anthropomorphism refers to something nonhuman behaving as human, while personification gives particular human traits to nonhuman or abstract things, or represents a quality or concept in human form. Understanding when to use personification vs. anthropomorphism will help you improve your use of figurative language.