Which of thfollowing components was NOT part of thearth's early atmosphere?
A) carbon dioxide
B) water vapor
C) nitrogen
D) oxygen gas
E) hydrogen gas
Correct Answer:
Verified
Q9: Which of thfollowing elements is (are) likely
Q10: What was thprobablsourcof gases constituting thearly atmosphere?
A)other
Q11: Scientific evidences suggest that oxygen gas appeareon
Q12: Which of thfollowing diseases has been eradicatefrothUnites
Q13: HIV may affect
A)the human reproductive system.
B)the human
Q15: According to scientific evidences, many organic compounds
Q16: Malaria is still common in which of
Q17: Thfirst life-relateancarbon-basemoleculwas synthesizein vitro by a German
Q18: Thearth another planets of thsolar systewerformeabout _
Q19: Malaria is likely to bendemic in
A)Russia.
B)North China.
C)Gabon.
D)Belgium.
E)New
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