Which of the following plays an important role in screening out harmful ultraviolet rays?
A) atmospheric oxygen
B) water
C) methane
D) ozone
Correct Answer:
Verified
Q25: All of the following would have been
Q26: Oxygen would interfere with organic molecules by
A)
Q27: In earlier times those who believed that
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Q29: No other planet in our solar system
Q31: The first primitive cells probably came into
Q32: The oldest fossils are about _ billion
Q33: The oldest fossils of eukaryotic cells are
Q34: When oxygen became part of the atmosphere,
Q35: The first multicellular organisms (algae) appeared about
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