Final answer:
Natural selection is a concept in Biology where individuals with advantageous traits for survival and reproduction are more likely to pass on their genes to the next generation. This results in the gradual evolution and adaptation of populations.
Step-by-step explanation:
Natural selection, also known as 'survival of the fittest,' is a key concept in Biology. It refers to the process by which individuals with traits that are advantageous for survival and reproduction are more likely to pass on their genes to the next generation. This leads to the gradual evolution and adaptation of populations to their environments. Natural selection operates based on three principles: inheritance of characteristics, competition for limited resources, and variation in traits among offspring.