9. Which of the following statements best explains the Theory of Natural Selection? *   A. Organs that are not used may disappear, while organs that are constantly used may develop B. In nature, the organism with desirable characteristics may survive, while those weaker traits may not C. Organisms develop desirable structures to survive in a given environment D. Acquired characteristics of parents can be passed on to offspring   10. Which of the following statements explains Lamarck’s Theory of Use and Disuse? *   A. Body structures develop because they are used extensively B. Body structures develop because they are not use C. Body structures develop because of competition D. Body structures develop because of mutation

Q: "Differential reproductive success of individual organisms":

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Evolutionary adaptations

Evolutionary adaptation is the process through which organisms adapt or adjust to their surroundings to increase the chances of survival, mating, and reproduction. An organism's behavior, physiology, and structure are adjusted or changed to make it more suited to its environment.