It is intended to increase immunity against that antigen back to protective levels, after memory against that antigen has declined through time.
Answer:
forest fires<em><u>.</u></em>
Explanation:
forest fires are human caused and can destruct the habitat and nutrition of the animals severely
Answer:cus it can turn to something dangerous
Explanation:
The right atrium<span> is one of the four chambers of the heart. The heart is comprised of two </span>atria<span> and two ventricles. Blood enters the heart through the two </span>atria<span> and exits through the two ventricles. Deoxygenated blood enters the</span>right atrium<span> through the inferior and superior vena cava</span>
