Question

cells require what to produce the molecule that our body uses for chemical energy?
blood and molecules from the food we eat
oxygen and molecules from the food we eat
oxygen and carbon dioxide
air and carbon dioxide

Explanation:

To produce ATP (the molecule for chemical energy), cells perform cellular respiration. This process requires oxygen (to act as the final electron acceptor in the electron transport chain) and glucose (a molecule from food, broken down into smaller molecules like pyruvate) as reactants. Blood is a transport medium, not a direct reactant. Carbon dioxide is a product, not a reactant. Air is a mixture, and cells specifically need oxygen from it, not air as a whole with carbon dioxide. So the correct option is the one with oxygen and food - derived molecules.

Answer:

B. Oxygen and molecules from the food we eat