50% of the lunar surface is always illuminated by Sun.
The molten material moving in the mantle due to circulation moves the lithospheric plates
Answer:
Explanation:
You have external defense systems, which include your skin, tears, mucus, saliva, stomach acid, cilia (small hairs) and helpful bacteria. ... The skin stops pathogens from entering the blood, at least when you're not bleeding. The tears, mucus, and cilia trap them and help push them back out of your body.
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