Which of the following accurately describes covalent bonds? O A. Covalent bonds are formed when protons are shared between two
atoms.
B. Covalent bonds are formed when electrons are transferred from
one atom to another.
O C. Covalent bonds are formed when electrons are shared between
two atoms.
O D. Covalent bonds are formed when protons are transferred from one
atom to another

The answer is C, i passed Biology Last year

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.