Brightest planet:
A. Mercury
B. Venus
C. Mars
D. JUpitur
Nearest Galaxy from earth:
A. Andromeda
B. Cartwheel Galaxy
C. Comet galaxy
D. None of these
Gap in railway tracks used for:
A. to avoid expansion due to heat
B. to smooth travel
C. to save money
D. None of These
What is the study of human populations called?
A. Ecology
B. Environmental Biology
C. Herpetology
D. Demography