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Using bamboo results in an increased use of forest trees. Bamboo is a grass, not a tree. I don't see how using more bamboo would increase your usage of trees. This option is incorrect.
Contour plowing is when your plow around the contour lines (which are basically like elevation lines) of a hill or slope. This actually reduces soil erosion and lasting effects of natural storms and disasters, so it does not result in a need for more land. This option is incorrect.
Setting irrigation systems to run longer results in a reduction of water use. Irrigation is a system of watering, so you need water for it. It would not reduce water use. This option is incorrect.
Building more wind farms results in a reduction of fossil fuel use. If you are getting your power from renewable resources like the wind or the sun, you will not need to use as many fossil fuels, and this would reduce their use. This option is correct.
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What observations are you talking about
A. the number of hydrogen bonds that hold the strands of DNA together
The longest period of time is 11 minutes and 35 seconds.
The factor that is most likely to have the greatest effect on the number of molecules mitochondria can produce is the number of H+ ions moving down the channel.
Hydrogen ions move from the outer to the inner compartment of the mitochondria through the electron transport system. The main purpose of the electron transport chain is to build up a surplus of hydrogen ions or protons in the inner membrane space so that there will be a concentration gradient compared to the matrix of the mitochondria. The concentration gradient helps in the generation of energy in the form of ATP.
