Which statement about sex cells is correct?

In reproduction, what is fertilisation?

What is a zygote?

Which of the following is not a part of the male reproductive system?

Where are the female sex cells contained?

About how long does the menstrual cycle take?

What is ovulation?

Which way does blood normally pass across the placenta?

Which of these is a role of oestrogen?

Which hormone is responsible for the development of male secondary sexual characteristics?