T cells attack antigens on foreign substances and B cells produce antibodies.
keep her as comfy as possible till her time comes
Answer:
3
Explanation:
Vaccines protect travelers from serious diseases. Depending on where you travel, you may come into contact with diseases that are rare in the United States, like yellow fever. Some vaccines may also be required for you to travel to certain places.
I looked it up and i found that C and D are the answers
