Chemical reactions within the body sometimes require special proteins called to catalyze the reaction.

In some plants, pointed leaves (p) are dominant over rounded leaves (p). a plant with a genotype of pp

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass

Which greenhouse gas is emitted when burn fossil fuels for energy? a.nitrogen b.oxygen c.carbon dioxide d.helium