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A. Dirty environment
B. Pollution
C. Mosquito
D. None of above
A. Andromeda Galaxy
B. Milky-Way
C. Spiral Galaxy
D. Horseshoe Galaxy
A. Deimos
B. Ganymede
C. Phobos
D. Arche
A. Stratosphere
B. Troposphere
C. Mesosphere
D. Thermosphere
A. Hydrogen
B. Helium
C. Nitrogen
D. Flourine
A. 4.4 billion years
B. 4.5 billion years
C. 4.6 billion years
D. 4.7 billion years
A. 4.51 billion years
B. 4.55 billion years
C. 4.53 billion years
D. 4.57 billion years
A. 4.14 billion years
B. 4.64 billion years
C. 4.54 billion years
D. 4.34 billion years
A. 16.5 billion years
B. 15.5 billion years
C. 13.5 billion years
D. 14.5 billion years
A. Messier 81
B. Andromeda
C. Triangulum
D. Whirlpool
