12. Select the answer from the menu. Natural selection CANNOT occur without __ -Choose the correct answer- Clear All competition for unlimited resources gradual warming of Earth genetic variation in species asexual reproduction in species

Natural selection CANNOT occur without genetic variation in species.<br /><br />Genetic variation is essential for natural selection because it provides the raw material for evolution. Without genetic variation, all individuals in a population would be genetically identical, and there would be no differences in traits for natural selection to act upon. Genetic variation arises through mutations, genetic recombination during sexual reproduction, and other processes, leading to differences in traits among individuals in a population. These differences can affect an individual's ability to survive and reproduce, and those with advantageous traits are more likely to pass on their genes to the next generation.