Have you ever heard of sexual reproduction and asexual reproduction? Sexual reproduction is where you reproduce sexually. Sexual reproduction is for multicellular organisms like humans and animals. Many organisms have parts that they can use to reproduce sexaually. Mostly humans and animals have these parts. When you reproduce, you create offspring, which can be children. Asexual reproduction is where only one parent makes offspring
Asexual reproduction is only for single celled organisms. Like bacteria and protozoa. Those organisms only have one cell and are not as complex and multicellular organisms. These organisms cannot reproduce sexually like humans and animals. Instead, they reproduce by themselves. Asexual reproduction only has one organism instead of two because those organisms don't have those parts like humans. Instead they have different parts. They also create offspring, but not from two parents. Instead, it is only one parent.