Answer:
One muscle flexes while the other extends
Explanation:
Answer:
D) Majority; unvaccinated
Explanation:
Herd immunity is a form of immunity that occurs when the vaccination of a significant portion of a population (or herd) provides a measure of protection for individuals who have not developed immunity
Answer:
All sexually transmitted diseases can be prevented by abstinence (not engaging in sexual activity) and using protection.
If one is sexually active, get tested for STIs regularly. Make sure the partner has been tested as well.
Some STIs are syphilis, genital herpes and hepatitis B.