External fertilization occurs mostly in

1. human beings
2. frogs
3. snake
4. birds

Sperms are produced by

1. urethra
2. ureter
3. testes
4. ovaries

The sperms reach the urethra by travelling through the

1. scrotum
2. testes
3. sperm duct
4. vagina

The release of an egg from an ovary is called

1. fertilization
2. menopause
3. menstruation
4. ovulation