Explain fertilization and formation of embryo foetus?

Fertilization occurs when a sperm cell from a male merges with an egg cell from a female, resulting in the formation of a zygote. This single-celled zygote undergoes a series of cell divisions, known as cleavage, as it travels down the fallopian tube to the uterus. Once in the uterus, the developing structure, now called a blastocyst, implants into the uterine lining and begins the process of embryonic development. Over approximately nine months, the embryo grows and differentiates into various tissues and organs, eventually forming a fully developed fetus.