How does the concentration of the substrate in an enzyme-controlled chemical reaction change over time?

The substrate concentration decreases rapidly until a saturation point is reached where there is no further change in substrate concentration.

Explanation:

One of the most important parameters in discussion of rate of enzyme catalysed reaction is the substrate concentration. The rate of reaction increases smoothly as the rate of reaction until a point is reached and the rate of reaction becomes independent of substrate concentration. This is the saturation point.

heat or electricity in the atmosphere- c.

the objects have the same charge.