Jeannie put her soccer ball on the ground on the side of a hill. Which force acted on the soccer
ball to make it roll down the hill?
A. gravity
B. electricity
C. friction
D. magnetism

A. gravity

Explanation:

gravity is a force that makes things go downwards in this case Jeannie put her soccer ball on the ground on the side of the hill, the hill was in the top hence the ball went downward

enzyme active site and substrate specificity

enzymes bind with chemical reactants called substrates. there may be one or more substrates for each type of enzyme, depending on the particular chemical reaction. in some reactions, a single-reactant substrate is broken down into multiple products