Answer:
Acquired immunity
Explanation:
Acquired immunity is a type of immunity that we obtain by exposing ourselves to new antigens. When our body is exposed to a new antigen, the T cells, and the B cells, which are lymphocytes, attack the antigen by creating specific antibodies and activating other cells that prevent the antigen from harming the body. Some of these B and T cells transform into memory cells that will circulate through our body for years. As a result, when our body is exposed again to the same antigen, the memory cells recognize it and start a quick immune response by synthesizing specific antibodies.
Vaccines use this method. They have a modified or artificial pathogen similar to the real one, so when we are injected with it, our body develops antibodies for that specific pathogen. As a result, if we are infected with the pathogen again, our body will have a quick immune response and stop the infection.
<span>The junction between the digestive tract and the respiratory system is the pharynx. </span>
"Expectancy-value theory". This theory is based upon what a specific person values determines their motivation.
<span>B. Regular physical activity can help with energy levels, can improve self-image (and, thereby, school attendance), but it will not decrease a person's attention span. If anything, the person will increase their span because of the focus required to perform the activity to an acceptable level.</span>
