Enzymes are added to a chemical reaction to lower the activation energy. What is an enzyme classified as? a catalyst
an inhibitor
an accelerator
a depressant

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

What is the most important factor in determining climates.

The same side of the moon always faces earth because the