The human body comes from the reproduction systems of the male and a female. Male sperm can fuse with a female egg to form a fetal cell. Then, through mitosis, cells can replicate and grow through complex chemical processes (matter cannot be created/destroyed, but can change form). This allows a single cell to begin to duplicate into a complete human baby deployed through birth.
If you are curious as to who asked, the meme title was the one who asked.