The first answer or “t” :)
Combustion
It is an example of a simple chemical reaction. In a combustion reaction, oxygen reacts with another substance to produce carbon dioxide gas and water vapor.
Soil, rocks, rain, and temperature.
Answer:
The independent variable is the height of the ball that bounces.
This all depends on lots of independent variables such as force used to roll the ball, wind resistance, etc. With no variables included, they would both move at the same velocity.