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Q40: Which of the following types of stars
Q43: When the Earth first formed it had
Q55: What color does the planet Mars appear
Q57: Like our own moon, many Jovian moons
Q57: Stars are mostly made of<br>A) hydrogen and
Q69: In which eon of Earth's history did
Q78: Which of the following could be a
Q92: If we compress the entire history of
Q109: The first living organisms interacted with the
Q124: The very first living organisms on the