I think it is 24 because it just is
Answer:
Humans—and other complex multicellular organisms—have systems of organs that work together, carrying out processes that keep us alive. ... Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs.
1. hair
2. pore
3. oil gland
4. sweat gland
5. hair follicle
6. blood vessels
