Answer:
When you release the opening of the balloon, gas quickly escapes to equalize the pressure inside with the air pressure outside of the balloon. The escaping air exerts a force on the balloon itself. ... That opposing force—called thrust, in this case—propels the rocket forward.
The most likely element is silver
in second place is copper
Over time, yes. It will over time gain more momentum
The vacuoles because the plant's central vacuole is bigger.