Which of the following processes involves the combination of two haploid sex cells?

The process that involves the combination of two haploid sex cells is sexual reproduction. In sexual reproduction, two gametes, which are haploid cells (each containing half the genetic material), come together to form a diploid zygote. This merging of genetic material facilitates genetic diversity, which is a key advantage of sexual reproduction.

In contrast, asexual reproduction occurs without the fusion of gametes and results in offspring that are genetically identical to the parent organism. Vegetative propagation is a form of asexual reproduction where new plants grow from parts of a parent plant, such as roots, stems, or leaves. Self-pollination refers specifically to the fertilization process within flowers of the same plant, where pollen from the same flower fertilizes its ovules, which is still a form of sexual reproduction; however, it is more specific and does not encompass the broader concept of combining haploid sex cells from different individuals.