A, the earth system
The boundary would be the atmosphere, as energy cannot leave. No mass is shared between the rest of the universe and Earth
I believe it's B. Sharecropping was a bit better than slavery but the owner still took advantage of workers.
the tone of this excerpt is optimistic
Answer:
The <u><em>absolute value </em></u>of an integer is the <u><em>distance</em></u> that number is from <u><em>zero</em></u> on a number line. (# of steps from zero)
