what can persist in the circulation for decades?
active immunity density Veins and arteries. oxygen cells bacteria chlorofluorocarbons fur and fat Chemical energy
A B C D E F G H
Memory cells persist in the circulation for decades.
active immunity can persist in the circulation for decades
what can persist in the circulation for decades? (A) active immunity (B) density (C) Veins and arteries. (D) oxygen cells (E) bacteria (F) chlorofluorocarbons (G) fur and fat (H) Chemical energy