For sperm to develop properly they must be in an environment that is below abdominal body temperature. The scrotal sac is equipped with muscles that may raise or lower the testes. A female has more oocytes before she is born than at any time during her life. Meiosis II will not occur in an oocyte unless it is fertilized. Fertilization usually occurs in the vagina.
Implantation occurs in the uterus.
The vagina serves as the birth canal. The capsids of all viruses are alike. A virus uses either DNA or RNA as its core, but not both. Viruses can be replicated only after they enter a living cell. Most viruses have a protein coat or covering.