Thearth another planets of thsolar systewerformeabout __________ billion years ago.
A) 3.8
B) 4.6
C) 3.0
D) 2.9
E) 5.1
Correct Answer:
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Q13: HIV may affect
A)the human reproductive system.
B)the human
Q14: Which of thfollowing components was NOT part
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
Q19: Malaria is likely to bendemic in
A)Russia.
B)North China.
C)Gabon.
D)Belgium.
E)New
Q20: Microorganisms may possibly adapt to which of
Q21: Thfirst organisms
A)had to be autotrophic.
B)were parasitic.
C)obtained energy
Q22: Photosynthetic organisms using thoxygen-releasing pathway appeareon earth
Q23: Two researchers suggestein th1960s that _ may
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