In a chemical reaction, a reactant binds to an enzyme at a region known as the
a. catalyst.
b. product.
c. substrate.
d. active site.

Which term best describes a community in which people work mostly in factories? a.agricultural. b.hunting and gathering. c.domesticated. industrial.

What is called the "building block" of life?

The picture represents a structure of the respiratory system. which is the function of this structure? to bring air into the body to exchange oxygen with carbon dioxide to carry air to the lungs to release oxygen from the body