What led to a population increase during the Song dynasty in China?
The one child policy was lifted at the end of the Tang dynasty
Buddhist monks were allowed to marry which led to increased family size.
A new form of rice was introduced that was drought resistant and yielded
two crops a year.
Crops from the New World including the potato were introduced which led
to longer life expectancy rates.
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Unit 1. The

Based on the graph, how is coal consumption likely to affect future generations? a. the higher our current rate of consumption, the less coal will be available in the future. b. current rates of consumption are irrelevant because new coal will form in the future. c. the lower our current rate of consumption, the more slowly coal will be replenished for the future. d. regardless of current rates of consumption, coal will always be available.