Question

which substance is released during the krebs cycle? * 1 point substance is released image of mitochondrion with krebs cycle and question mark atp nadh glucose carbon dioxide

Explanation:

The Krebs Cycle (Citric Acid Cycle) is a part of cellular respiration. During this cycle, carbon dioxide ($\ce{CO_2}$) is released as a by - product when acetyl - CoA is oxidized and the carbon atoms are removed in the form of $\ce{CO_2}$. ATP is produced in small amounts, but it's not the main substance released in the sense of being a waste product. NADH is produced (as a carrier of electrons), not released as a waste. Glucose is broken down before the Krebs Cycle (in glycolysis), so it's not released during the Krebs Cycle.

Answer:

Carbon Dioxide (assuming the last option is "Carbon Dioxide", the answer would be the option corresponding to Carbon Dioxide, e.g., if the options are A. ATP, B. NADH, C. Glucose, D. Carbon Dioxide, then the answer is D. Carbon Dioxide)