Solution: One egg is discharged from each of the ovaries once a month. The egg is moved from the ovaries to the fallopian tube. Only one sperm can access the egg at a time when sperm move towards the fallopian tube. Fertilization is the term for this procedure.

A menstrual cycle lasts approximately 28 days. This means that in each menstrual cycle, only one egg is available for fertilization. As a result, fertilization can only take place once every month.