Snowboarding if im correcting, you have to hold things for a and d, and b requires upper body strength
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.
Can you give me the multiple choices as well?
