What gives rise to an adult individual?

Where does fertilisation take place in human beings? What changes occur in the egg cell (ovum) during fertilisation?

What is/are the function$(s)$ of fertilizin?

$Statement I$: Penetration of sperm into ovum is a chemical process. $Statement II$: Acrosome of sperm secretes hyaluronidase which dissolves the corona radiata of the ovum.

What triggers the acrosome reaction in a sperm?

Where does fertilization occur in the human female reproductive system?