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Based on the graph, the birthrate and death rate were most likely to be equal
between years
A. 1 and 2
B. 9 and 10
C. 7 and 8
D.4 and 5

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.

explanation:

true is the final answer!