CDC conducts studies each year to determine how well the flu vaccine protects against flu illness. <span>While vaccine effectiveness can vary,</span> recent studies show vaccine reduces the risk of flu illness by about 50% to 60% among the overall population during seasons when most circulating flu viruses are like the vaccine viruses.
Answer:
because as you grow up the muscles also grow
Answer:
I would say D
Explanation:
many people use pollution during the hours of these times as they are home from work and school
Answer:
D) is the answer because it only allows particular molecules to get in and out