Introduction

Reproduction is an essential function in human beings. It enables humans to produce individuals similar to themselves.

In this unit you will learn how the reproduction that started your life occurred.

Where were you before you were born?

While your body was forming and growing, you spent nine months in your mother’s body.

Your body is formed by millions of cells, but your life started with one cell, which divided into many different cells over time.

This first cell was very special: it was the result of the union of two cells, one from your father and the other from your mother.