Answer:
Well it would be D
Explanation:
A: Back blows for de infants
B: well its in a
C: That is for infants
D:Correct i think
Answer:
Microbe
Explanation:
Viruses and Bacteria are microbes that cause disease.
So its acquired immunity and the cells responsible are the B lymphocytes that produces antibodies against the virus. Memory is keep since first encounter of the virus by the immune system by way of the antibodies that was initially produced. The antibodies are there already, which makes it fast to act upon when expose again.
Answer:
A) To provide oxygen to the person's lungs.
