Based upon the location of these ancient civilizations, what was one key advantage for the Egyptians and Chinese vs. that of the Mesopotamians?

a is your answer hope this ! : )

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light has energy and momentum and so the beams are ever so slightly attracted to each if they had mass. they will ever so slightly curve space.

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they are the same thing, it's about what you identify as (ex: heterosexual, bisexual, homosexual etc.) and who you are romantically attracted to.