Here's why:

* Haploid cells have only one set of chromosomes, whereas diploid cells have two sets.

* Meiosis is a type of cell division that reduces the number of chromosomes in a cell by half.

* Gametes, the sex cells (sperm and egg), are haploid cells produced by meiosis.

* When a haploid sperm cell fertilizes a haploid egg cell, the resulting zygote is diploid, inheriting one set of chromosomes from each parent.

Therefore, meiosis is the specific biological process responsible for producing haploid cells.