Which element is essential to making up all organic molecules?

A. Oxygen

B. Carbon

C. Nitrogen

D. Hydrogen

What is activation energy? A. energy required by the substrate to fit into the active site B. energy supplied by enzymes in a chemical reaction C. energy released when reactants combine to become products D.

Which effect does fertizler runoff have on North Carolina lakes and streams

What is the main type of weathering illustrated by this weathered limestone?

Why are humans primarily eating at all leaves of the food chain?

The (a. internal b. external c. animal d. receptor) senses give the body information about the outside environment.

How did Darwin's understanding of heritability weaken his arguments?

Which statement best describes the overall change that occurs as a result of mitosis?

When people plant vegetation they what? erosion

What is a polypeptide?

Sound cannot travel though a what?