how sperm reaches the egg
The egg travels down the fallopian tube, pushed by tiny hairs and awaits the arrival or sperm. About a teaspoon worth of semen enters the vagina containing roughly 300 million sperm, less than 100,000 will pass into the cervix to begin their 6-inch journey to the egg. A long, whiplike tail propels each sperm toward the waiting egg. Most sperm will lose their way. Only about 200 sperms successfully reach the egg.