Question

respiration and combustion (burning) both produce.... coal glucose oxygen carbon dioxide all of these

Explanation:

In respiration, cells break down glucose using oxygen to produce carbon dioxide, water, and energy. In combustion (burning), substances like fuels react with oxygen, producing carbon dioxide (along with other products like water, depending on the fuel). Coal is a fuel (reactant in combustion, not a product), glucose is a reactant in respiration, and oxygen is a reactant in both (not a product). So the common product is carbon dioxide.

Answer:

D. Carbon dioxide (Note: Assuming the options are labeled as A. Coal, B. Glucose, C. Oxygen, D. Carbon dioxide, E. All of these. Since the original options' labels aren't shown, but based on content, the correct option is the one with "Carbon dioxide". If the original option for carbon dioxide is, say, the fourth option, then the answer would be the identifier and text of that option. For example, if the fourth option is "D. Carbon dioxide", then the answer is D. Carbon dioxide.)