d is the answer please mark me brainlest
They should mostly ask if a hydroelectric power plant emit less CO2 than a thermal power plant. In global warming, CO2 is one of the elements that causes global warming.
The answer is A-Relied on the horse and used the tepee to allow them to be nomadic.
Answer:
A) secondary
B) primary (but really depends what the report is on)
C) primary
D) secondary
Explanation:
A primary source is first-hand information
A secondary source is second-hand information (so not written/from the person the document is talking about)
