Question

a. digestion breaks down food to provide fuel, and respiration brings in carbon dioxide to react with that fuel to

b. digestion breaks down food to provide fuel, and respiration brings in oxygen to react with that fuel to produ

c. digestion breaks down food to provide building materials, and respiration brings in oxygen to increase the ar

d. digestion breaks down food to provide building materials, and respiration brings in carbon dioxide to increa

Explanation:

To solve this, we analyze the roles of digestion and respiration. Digestion breaks down food into nutrients (fuel like glucose). Respiration (cellular) uses oxygen to react with fuel (glucose) to produce energy (ATP), CO₂, and H₂O. Option A is wrong (respiration uses O₂, not CO₂). Option C and D misstate digestion’s role (it provides fuel, not just building materials; building materials are also from digestion but the key fuel - related role here is for energy production via respiration with O₂). Option B correctly states digestion provides fuel and respiration brings O₂ to react with fuel.

Answer:

B. Digestion breaks down food to provide fuel, and respiration brings in oxygen to react with that fuel to produ