Which component of a chemical reaction does not change from beginning to end? a co-factor substrate concentration enzyme concentration hot temperature

Ans. Enzyme concentration.  

Enzymes are defined as bio-catalysts that increase the rate of biological reactions by decreasing activation energy of the reaction. Enzymes do not start the reactions, they just speed up the reactions.  

During a chemical reaction catalyzed by an enzyme, the total amount of enzymes does not change in anyway or destroyed as it remains constant from beginning to the end of reaction.

Thus, the correct answer is option). 'enzymes concentration.'

i think it is dna, i'm not totally sure but i think it might be.

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above