Answer:
The immune (ih-MYOON) system attacks germs and helps keep us healthy. What Are the Parts of the Immune System? ... White blood cells, also called leukocytes (LOO-kuh-sytes), play an important role in the immune ... That way, if the immune system encounters that antigen again, the antibodies are ready to do their job
Explanation:
Answer: B
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The first answer because it lets his father know he is worried about him
B Fitness workers provide instruction in aerobic exercise, strength training, and stretching.
