Imagine that NASA discovered a new planet with an atmosphere rich in hydrogen gas,hydrogen sulfide,ammonia and methane.We would call this a(n)
A) reducing atmosphere,because of the availability of hydrogen atoms that can donate electrons.
B) reducing atmosphere because the atmosphere would reduce the energy necessary to build molecules.
C) oxidizing atmosphere because of the availability of oxygen compounds.
D) oxidizing atmosphere because of the lack of oxygen gas.
Correct Answer:
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Q7: The oldest fossils of eukaryotes have been
Q8: Life apparently originated on Earth about
A)1 million
Q9: Which one of the following statements about
Q10: Which of the following was demonstrated by
Q11: Homo sapiens have existed on earth for
Q13: The apparatus in the figure was used
Q14: The group that probably gave rise to
Q15: All of the following were produced in
Q16: The oldest microfossils are of
A)prokaryotes.
B)eukaryotes.
C)insects.
D)pollen grains.
E)small animals.
Q17: The age of the Earth according to
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