Mesosphere is the layer after stratosphere, which is after troposphere, as seen from Earth in the direction of Space.
It starts at 60 km and ends at 120 km, after which comes the termosphere.
So we're looking for a line that's closest to 100 km, and this is the shortest line, A.
Do you have a picture of the page? Maybe I can help...
A. More food allows people to hunt more.
B. More food allows the population to move from place to place.
C. More food allows people to control their source of water.
D. More food allows the population to grow.
Erosion is the process of removing rock particles by water, wind, ice or gravity.
