<span>D. The Executive Office Of the president - beanz:) </span>
Answer:
I believe the answers are:
A. Radiation
B. Convection
C. Conduction
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The Heliocentric Theory is that Earth and all other planets all revolve around the Sun and the Sun is the center of the universe, instead of the Geocentric Theory which put the Earth at the center of the universe.
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<span>Unlike primary source, a secondary source can be : B. written or created by an educated person or trained expert
In order to be categorized as a primary soruce, the surce must be directly involved and exist when the event/occurence is happening. Secondary source could be anything as long as it related to the event</span>
"<span>C.There was no form of writing" would be the best option as to what defines prehistory, since for people today to know how these ancient people lived they must rely on archeology and other means.</span>