Answer:
a
Explanation:
sports anemia is a false anemia and a beneficial adaptation to aerobic exercise, caused by an expanded plasma volume that dilutes red blood cells.
Lack of attention, unfocused, daydreaming, etc
AIDS is the most severe phase of HIV infection, when a person’s immune system is severely weakened. When HIV weakens the immune system opportunistic infections occur in the body. The low number of helper T cells in the blood and the badly damaged immune systems leads the infected to get an increasing number of severe illnesses, called opportunistic illnesses. Opportunistic infections are infections caused by pathogens that take advantage of an opportunity not normally available.
