What is the result of successful fertilization?

Successful fertilization occurs when a sperm cell successfully penetrates an egg cell, resulting in the formation of a zygote. A zygote is the initial cell that forms when a sperm and an egg fuse, containing genetic material from both parents. This single cell will subsequently divide and develop into an embryo, eventually leading to the formation of a new individual if conditions are favorable.

The other options do not describe the outcome of successful fertilization. The release of more eggs refers to ovulation, which occurs independently of fertilization. An increase in menstrual flow is related to the shedding of the uterine lining and does not result from fertilization. Development of sperm takes place in the male reproductive system and occurs prior to fertilization, not as a result of it. Thus, the formation of a zygote is the clear and direct outcome of successful fertilization.