Enzymes influence chemical reactions in living systems by

Often, reactants are found in low concentrations. Because the reactions must take place very quickly, they usually need a catalyst. Enzymes are catalysts for chemical reactions in living things. Enzymes, like other catalysts, lower the activation energy and increase the rate of chemical reac- tions.

hope this helps!

(im only a 6th grader so I might be wrong but this is how i define it)

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!

photosynthesis makes the glucose that is used in cellular respiration to make atp. the glucose is then turned back into carbon dioxide, which is used in photosynthesis. while water is broken down to form oxygen during photosynthesis, in cellular respiration oxygen is combined with hydrogen to form water.