In a changing environment, a population of organisms that reproduces sexually via meiosis…

In a changing environment, a population of organisms that reproduces sexually via meiosis has an advantage over one that reproduces asexually via mitosis alone. Which of the following statements correctly explain(s) this advantage?

I. Meiosis generates genetic variation through crossing over and independent assortment.
II. Genetic variation allows some individuals to adapt to environmental changes.
III. Meiosis ensures conservation of chromosome number across generations.
IV. Asexual reproduction produces offspring genetically identical to the parent.
V. Mitosis is a faster and more energy-efficient mode of reproduction.