When it first formed, the Sun was 75 times more luminous than it is now.
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Q29: The process by which life formed from
Q30: Mound-like structures that represent the remains of
Q31: Oxygen accumulated in the atmosphere via _.
A)
Q32: The time in Earth's history before 4
Q33: What are the primitive organisms thought to
Q35: What is the metabolic process in which
Q36: Organisms that do not depend on oxygen
Q37: Most continents contain large central areas in
Q38: Despite their differences, the terrestrial planets have
Q39: Hot mineral-rich seawater is ejected from _.
A)
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