Which statement best explains how enzymes speed up chemical reactions?
question options:

a. enzymes lower the activation energy of a reaction.

b. enzymes gain heat from chemical reactions.

c. enzymes change shape during chemical reactions.

d. enzymes use light energy to speed up chemical reactions.

The correct option is A) Enzymes lower the activation energy of a reaction.

Enzymes are also called as catalyst. They increase the rate of reaction by lowering the activation energy of the reaction. This means that they speed up the chemical reactions by doing so.

Activation energy is the minimum amount of energy required by a reactant to form an activated complex in order to initiate the chemical or nuclear reaction.

Thus, enzymes speed up the chemical reactions by lowering the activation energy.

by drinking easy

very easy

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."