Answer:

1. Fertilization is the fusion of haploid gametes, egg and sperm, to form the diploid zygote.

2. Menstruation, or period, is normal vaginal bleeding that occurs as part of a woman's monthly cycle.

3. Ovulation is the release of an egg from your ovary, into your fallopian tube. It typically happens about 13–15 days before the start of each period (1).