They provide the immune system with "memory" against previously encountered pathogens.
T memory cells are necessary for protective immunity against invading pathogens
Answer:
While Earth orbits the sun, the planet is simultaneously spinning on an imaginary line called an axis that runs from the North Pole to the South Pole. It takes Earth 23.934 hours to complete a rotation on its axis and 365.26 days to complete an orbit around the sun.
Explanation:
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Pillow lava is evidence of sea-floor spreading because the lava comes up out of cracks at the mid-ocean ridge and becomes newly formed rock. The farther away you get from the mid-ocean ridge, the older the rock is.
There are several ways energy could run an electric circuit. but the fundamental way is either through a/several wiring. in a house you need to install <span>an electric circuit and connect it via wires throughout other outlets or electrical panels in the house. HOPE THIS HELPS!!</span>