It became clear in the 1970's
Answer: A) a process of change in a population through time
Explanation:
Answer:
Because you body is introduced to the virus, it is familiar to it and can build up an immunity to the weakened form so when the actual virus invades, your body know what to do.
Explanation:
<span>hose at risk of exposure to blood or bodily fluid
The health care employees that are eligible to receive a hepatitis b vaccination for free are those who are at a high risk of exposure to contaminated blood or bodily fluid, this is in the hope to prevent them from catching hepatitis b while dealing with patients.</span>
