Muscles use a lot of cellular energy because they are highly functional. Which organelle would be in abundant to provide that energy?
Vacuole
Chloroplast
Mitochondria
Nucleus

in a chemical reaction, the atoms and molecules produced by the reaction are called products. no new atoms are created, and no atoms are destroyed. in a chemical reaction, reactants contact each other, bonds between atoms in the reactants are broken, and atoms rearrange and form new bonds to make the products.