Which term denotes the theory about the processes that produced biological diversity?

• A. Evolution
• B. Adaptation
• C. Fossil record
• D. Isotonic

Answer: (A)

Evolution is the idea that populations change over time through processes such as natural selection, mutation, genetic drift, and gene flow, and these changes accumulate to produce the vast diversity of life. Over many generations, inherited variations that improve survival and reproduction become more common, leading to new species and a wide range of forms. For example, different environments can favor different beak sizes in finches, illustrating how selection shapes traits and diversity. The fossil record provides evidence of these changes over time, while adaptation refers to a trait that helps an organism survive, not the overall mechanism behind diversity, and isotonic is unrelated to how life becomes diverse.