The Earth's population has ________since the turn of the century
Options
A. Stayed the same
B. doubled
C. trebled
D. multiplied ten times
Correct Answer
trebled
Explanation
The population increases in geometrical progression and has crossed the 5 billion mark. The united nations estimate an average growth rate of 1.5% per annum.
More questions
1. The mean surface temperature of the sun is estimated to be of the prder of