Final answer:
Competition is a driving force behind natural selection in biology.
Step-by-step explanation:
In natural selection, competition is a driving force. Competition occurs when individuals of the same or different species compete for limited resources, such as food, water, or shelter. The individuals best suited to their environment, meaning those who are better able to compete and survive, are more likely to reproduce and pass on their advantageous traits to future generations. This process leads to the gradual adaptation and evolution of species.