How long is the average menstrual cycle?

How many parents are required for sexual reproduction?

Which of these is NOT part of the male reproductive system?

What is the female sex hormone?

What is the average age for puberty to start in females?

Everyone goes through puberty at the same age

Where is sperm produced?

Frogs reproduce sexually, but what type of fertilisation do they undergo?

When a male and female gamete combine, they produced what will eventually become a baby. What name do we give it in the early stages of growth?