True
<span>Rickettsia species are carried as parasites by many ticks, fleas, and lice, and cause diseases such as typhus, rickettsialpox, Boutonneuse fever, African Tick Bite Fever, Rocky Mountain spotted fever, Australian Tick Typhus, Flinders Island Spotted Fever and Queensland Tick Typhus in human beings.</span>
Answer:
Antibodies help you immune system.
Answer:
NAD+
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Choloesterol is present in the membrane. It's role in the membrane is permeability reduction. Cholesteron is also used in corticosteroids synthesis(hormone secreted by the renal glands)