One is left and one is right
It is recognised that the retention of heritage buildings has environmental sustainability benefits. Conserving heritage buildings reduces energy usage associated with demolition, waste disposal and new construction, and promotes sustainable development by conserving the embodied energy in the existing buildings.
Answer: The Song set up supervised markets along the border to encourage this trade. Chinese goods that flowed north in large quantities included tea, silk, copper coins etc. Technology was highly advanced in fields their as diverse as agriculture, iron-working, and printing. Indeed, scholars today talk of a Song economic revolution. The population grew rapidly during this time, and more and more people lived in cities.
Explanation:
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