Answer:
Explanation:
When the body senses foreign substances (called antigens), the immune system works to recognize the antigens and get rid of them. B lymphocytes are triggered to make antibodies (also called immunoglobulins). These proteins lock onto specific antigens.
Answer:A
Reason bc second hand smoke is real and the want less people to smoke
Answer:
he suffered from SCID/severe combined immunodeficiency.
hope this helps! :)