Question

summarize: Natural selection acts at the level of individuals. It is the individual organism that lives or dies, reproduces or fails to
reproduce because of its characteristics. Fitness is the ability of an organism to survive and reproduce in its specific
environment. When more individuals with particular traits survive, the overall population will change over time — it will be
made up of more and more individuals with those successful characteristics.

Answer 1

Natural selection operates at the individual level, where each organism's traits determine its survival and reproductive success. Fitness refers to an organism's ability to thrive and reproduce in its environment. As individuals with advantageous traits survive and reproduce, the overall population gradually shifts to include more individuals with those traits over time.