The answer please to this and how it’s urgent

An experiment is designed to test the relationship between the initial height of a basketball before it is dropped to the height of its rebound bounce. the height of the rebound bounce is measured using a scale positioned behind the ball. in the above experiment, which condition would not be controlled? a). the starting height of the ballb). the surface the ball bounces on c). the type of ball d). the method to measure the rebound height of the ball

What happens in a global convection cell

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?