In which of the following past Earth atmospheres did photosynthesis begin?
A) living atmosphere
B) modern atmosphere
C) evolutionary atmosphere
D) primordial atmosphere
Correct Answer:
Verified
Q2: Stars give off electromagnetic radiation because
A) matter
Q3: Which of the following is false regarding
Q4: The solar wind consists principally of
A) neutral
Q5: The flattened structure of the Milky Way
Q6: Light travels at a speed of approximately
A)
Q7: Our planet and our lives are powered
Q8: Which of the following is true about
Q9: The planetesimal hypothesis pertains to the formation
Q20: Which of the following is true?
A) The
Q35: On its way to Earth, the solar
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