Answer:
Vaccines prevent the spread of contagious, dangerous, and deadly diseases. These include measles, polio, mumps, chicken pox, whooping cough, diphtheria, and HPV. The first vaccine discovered was the smallpox vaccine. Smallpox was a deadly illness.
A vaccine activates our immune system without making us sick. Many dangerous infectious diseases can be prevented in this simple and effective way. A vaccine activates our immune system without making us sick.
Vaccines contain weakened or inactive parts of a particular organism (antigen) that triggers an immune response within the body. Newer vaccines contain the blueprint for producing antigens rather than the antigen itself.
Explanation:
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I'd say d is the answer. By chemical attack, it is specifically a gas attack. Gas masks, all buy one is able to put on their gas masks. Presumably that one guy died. B is definitely incorrect.
Answer:
is this a essay question ?
Explanation:
Marches.........................
D.The granola bar had a shiny rapper that she ate
