Answer:
The sun's gravity pulls on the earth, and the earth pulls back on the sun at the same time. This is why the center of the solar system is not the center of the sun. As one gravitational body gets bigger than the other, it circles closer to the center of the system (shown in red).
Explanation:
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Answer:
Nucleus
Explanation: it is the center of the atom, and contains protons and nuetrons
Answer: A. Sun, Moon, Earth
