Question

question 4
what is the crucial reactant required during the final step of cellular respiration?
sugars
oxygen
carbon dioxide
water
question 5

Explanation:

Cellular respiration has three main stages: glycolysis, the citric acid cycle (Krebs cycle), and oxidative phosphorylation (the final step). In oxidative phosphorylation, the electron transport chain is involved. Oxygen acts as the final electron acceptor. Without oxygen, the electron transport chain cannot function properly. Sugars are involved in earlier stages (like glycolysis). Carbon dioxide is a product of cellular respiration (e.g., from the citric acid cycle). Water is also a product (formed when oxygen accepts electrons and protons).

Answer:

Oxygen