LIFE SCIENCE

Detailed explanation-1: -The answer is (a). Nature selection works on variation already present in a population. Option c would be correct if it stated that ‘Species/populations evolve through natural selection’. They do so because of the fact that natural selection works on variation already present in a population.

Detailed explanation-2: -Those individuals with heritable traits better suited to the environment will survive and reproduce.

Detailed explanation-3: -Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.

Detailed explanation-4: -Natural selection is the process through which populations of living organisms adapt and change. Individuals in a population are naturally variable, meaning that they are all different in some ways. This variation means that some individuals have traits better suited to the environment than others.