Answer:
The correct answer would be A. Electron transport chain.
In cellular respiration, all the complexes associated with electron transport chain are usually located in the inner membrane of the mitochondria.
The electrons released by the oxidation of NADH and FADH₂ are transported by various electron carriers associated with electron transport chain. The electrons are finally accepted by oxygen to form water which is released as a byproduct.
The flow of electron through the electron transport chain is coupled with the pumping of protons across the membrane which leads to the formation of proton gradient.
This gradient (chemiosmosis) is used by ATP synthase located in the inner membrane to phosphorylate ADP into ATP.
No carbon based compound is used as reactant or product in electron transport chain.
The answer is true. There are more than one balance used in labs.
In developed countries , amount of food produced being increased is a positive effect of agricultural changes in the past century.
Agricultural changes in developed countries were set up such as application of fertilizers etc so as to achieve a maximum yield as the increasing population all over the world means increase in food production to cater for individuals and to prevent starvation and death.
Agricultural changes were also done to ensure goods produced have a very high quality.
The remaining options such as Desertification, Clearing of rainforests and contamination can be referred to as part of the negative effect of agricultural changes in the past century.
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Answer:
D
Explanation: it's maintained by physiological processes
