Consider statements about evolution: 1. Natural selection leads to adaptation. 2. Mutations are the ultimate source of genetic variation. 3. Evolution occurs at the individual level. Which are correct? MCQ with Answer and Explanation

Natural selection is the process where organisms with traits better suited to their environment are more likely to survive and reproduce, leading to adaptation of the population over time. Mutations, which are random changes in the DNA sequence, are the ultimate source of all new genetic variation upon which evolutionary forces act. Evolution is a population-level phenomenon, defined as a change in allele frequencies over generations; it does not occur within a single individual's lifetime. Thus, statements 1 and 2 are correct.