Humans are complex organisms made up of trillions of cells, each with their own structure and function.

https://www.medicalnewstoday.com/articles/318342
#How many #cells are in the #human #body? - Medical News Today
12 Jul 2017 ... The short answer is that the body of an average man contains around 30 to 40 trillion cells. The long answer is that scientists do not yet know ..