List any four methods of contraception used by humans. How does their use have a direct effect on the health and prosperity of a family?
Four Methods of contraception: Contraception to avoid pregnancy may be achieved by use of condoms, oral pills, copper T and sterilization (vasectomy and tubectomy).
For a healthy and prosperous family female-male sex ratio should be maintained by contraception methods noted above. Size of population remains controlled.
Using condom would help in prevention from transference of AIDS disease in humans.