Which conclusions does the passage best support? Choose three correct answers.
O China burned coal more than wood for heat.
O Marco Polo wrote about a new energy source from
China.
O China had used up most of its wood by clearing
D China lacked coal resources that could be easily
O Marco Polo helped spread technology and ideas
land for farming.
mined and burned.
from China to Europe.

A China burned coal more than wood for heat.

B Marco Polo wrote about a new energy source from China.

E Marco Polo helped spread technology and ideas from China to Europe.

Explanation:

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there are two main types of historical sources: primary sources and secondary sources. a primary source is something that originates from the past. it can be a chronicle, a piece of pottery, or even a piece of glacial ice that gives us climate data about the levels of atmospheric carbon one thousand years ago.