when the male and female cells join during fertilization, a(n) embryo forms
Explanation
During a males life, the sperm forms. During a females life, the egg forms. When a man and a woman fall in love, the reproduce, causing the sperm and egg join to form a embryo
On day one the levels of oestrogen and progesterone are low, having dropped quickly at the end of the last cycle. Low oestrogen level causes FSH release from the pituitary gland.
