Answer:
The answer to the question: Natural selection is based on Darwin´s observation that individuals most likely to survive and reproduce are those:___ would be, those who display adaptive traits to their environment and the demands of it.
Step-by-step explanation:
In the theory of Natural Selection, Charles Darwin observes and theorizes that nature itself selects those who will pass on their genes to the next generation, and those who will be selected for extinction, depending on whether they display the necessary adaptive traits that the environmental circumstances demands of them, or not. Those beings that do not adapt naturally to their environment, and display the necessary traits, are least likely to be chosen for reproduction and thus passing on their genetic traits to the next generations.