How is earth’s moon similar to the others?

those objects, which orbit the Sun, are planets and those objects, which orbit the planets, are moons. That is, moons with a small “m”, because if it had a capital “m”, it would be the moon of the Earth, known as the Moon.This is the main similarity between all the moons

the value of the 4 in the hundreds place is 400 while the value of th e 4 in the tens place is 40

400 is way bigger than 40.

i'm sure the answer you are looking for would be

a. an ice age

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