This is very possible becuase the earth orbits, and when it orbits, the sun moves to the other side of the planet, while we have night. when we see the moon at night, we can only see it when the suns reflection hits the moon to make it glow.
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Scalene a right triangle is a scalenece triangle
Pulsing I believe is the answer you might be looking for
Answer will be (B) to be exact