I researched and I believe the answer is both 2 and 4.
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.
A systemic response that raises body temp is a fever
<h3>Answer:</h3><h2>C. Helps increase stamina when exercising. .</h2><h3>Explanation:</h3>
The purpose of cool down exercises is to reduce the heart rate at a very controlled pace. This regulation of the heartbeat allows the body to receive oxygenated blood at a gradually slower pace till it is accustomed to the lower heartbeat, as opposed to a sudden decrease in the heartbeat, which would cause movement of blood away from heart thereby resulting in lightheadedness.
