__ 15. Which of the following is not true of an adaptation? a. It is an advantage to an organism in certain environments. b. It increases an organism's chance of reproducing c. It increases an organism's chance of survival. d. It decreases an organism's chance of evolving.

The correct answer is d. It decreases an organism's chance of evolving.<br /><br />Adaptations are traits or characteristics that have evolved in an organism over time to increase its chances of survival and reproduction in a specific environment. Adaptations are advantageous to an organism in certain environments, as they help the organism to better cope with the challenges and threats it faces. Adaptations increase an organism's chance of reproducing and surviving, as they provide the organism with a competitive advantage in its environment.<br /><br />However, adaptations do not decrease an organism's chance of evolving. On the contrary, adaptations are the result of evolution. Evolution is the process by which organisms change over time through the accumulation of beneficial mutations and the selection of those mutations that provide a survival or reproductive advantage. Adaptations are the result of this evolutionary process, and they increase an organism's chance of evolving further by providing it with a better chance of survival and reproduction in its environment.