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Earth's mass has remained constant, and thus the gravitational pull at the surface has decreased over time; Earth's mass has grown with the volume in such a way that the surface gravity has remained constant; Earth's gravity at its surface has increased over time, in line with its hypothesized growing mass and volume.
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are the best choices in my opinion.
A) Rosa Parks actions sparked the Montgomery bus boycott. She was forced to move to the back of the bus to give her seat up for a white woman, but refused to. During this time period in the South, African Americans were supposed to sit in the back of the bus, and could only sit in the front of the bus if no Whites were on the bus at the same time.
The guilds, banks, and money systems, which began in Medieval Europe, <span>were the start of modern market economies and trade unions.
Before them, there were no real market economies or unions - the guilds were the first type of a union of traders who wanted to unite and fight for their rights together.
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