Which of the following would be most affected by a change in the atmosphere?

What enzyme is most important for dna replication and why?

Which statement describes a way in which the digestive and excretory systems work together? a. the nephrons absorb nutrients from food going to the large intestine. b. the excretory system balances blood gases in the small intestine. c. the intestinal villi filter blood and send wastes to the bladder. d. the excretory system balances the salts and water obtained from digested food

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?