Which statement is correct about the Krebs cycle? I need this now plz help

A. Oxygen is a waste product of the Krebs cycle.

B. The Krebs cycle produces electron carriers for the electron transport chain.

C. Acetyl-CoA combines with pyruvic acid to make glucose in the Krebs cycle.

D. In the Krebs cycle, carbon dioxide is used to make glucose.

B. The Krebs cycle produces electron carriers for the electron transport chain.

Explanation:

Hope it helps!

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg 

the answer would be..

b. sucking