Because vaccines have healthy viruses that try to get your body to be immune to the diseases so when you are already sick your body won't respond to the vaccine because it's just more viruses
Answer:
population and environment are integrated terms. They are interrelated in many respects. Health of an individual is directly associated with the environment in which one is living. Similarly, rapid population growth provokes massive environmental degradation.
<span>The law that prohibited the marketing of new drugs unless they were adequately tested to demonstrate safety was the </span>Federal Food, Drug, and Cosmetic Act of 1938
