We inhale oxygen when we breath and exhale CO2. What is the oxygen used for and where does the CO2 come from? a) The oxygen is used during the electron transport phase of cellular respiration. The CO2 we exhale is formed during the citric acid cycle when the bonds in carbon compounds are broken.
b) The oxygen is used as an energy source for our cells. The CO2 is produced by the ATP synthase.
c) The oxygen is used during glycolysis to break down glucose. CO2 is produced as glucose is broken down.
d) The CO2 is used during electron transport as a final electron acceptor. Oxygen is produced during the citric acid cycle.

Agenetically engineered corn plant is approved for agricultural use. the plant produces pollen that can make its own toxins. these toxins protect the corn plant against pests and no longer require the application of chemical pesticide. what is a likely impact on the farmer of growing such a variety of corn? a- the financial costs for the farmer would be lowered since less crops would be lost to pests. b-the financial costs for the farmer would be lowered since more crops would be lost to pests. c-the farmer may be held responsible for increasing chemical pollution. d-the farmer's expenses for pest control would increase due to an increase in bee population.