Because gravity treats all mass equally. It doesn't treat heavier objects with greater force. All objects experience the gravitational pull equally. Making the two different weights reach the ground together simultaneously despite their weight differences.
The correct answer is Helium Nucleus. Hope this helps.
Answer:
store energy, digest food, and absorb shocks?
This question is very unspecific, but it is probably the Mantle. If that is wrong try Crust.<span />
The answer to 12 is that she would continue moving until something stopped her, i.e gravity
the answer to 13 is gravitational force. the gravitational force is stopping the chair from moving by pulling it down creating friction