Answer:
A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism. Enzymes are proteins that act as catalysts in biochemical reactions
Explanation: I don't know if this will help but hopefully it does
Answer:
Chemical properties are harder to change than physical properties.
Gravity: A force that keeps things in place sonit doesnt float around.
Mass: The amount of matter or substance that makes up an object
Weight: How heavy or light something is
Inertia: property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
The answer is A because if you want a reliable source of scientific information you should go to an actual scientist at a scientific conference.
