Well, i think the answer is B. 51 Kilometers
If it's a scientific experiment, it's very likely that they use internationally accepted measurement, which means the result will be in a metric system
Hope this helps
Sunlight - 9th down > Needed to chemically change water...
Population - 10th down > More than one organism of the same species...
Community - 3rd down > Different populations in a specific area...
Trophic Pyramid - 4th down > Shows the energy transfers of populations...
Food Web - 6th down > Shows the feeding relationships of the food chains...
Decomposer - 8th down > Helps dead things to chemically change...
The answer is A. resonance. A resonant frequency means a natural frequency which is a part of vibration made by the physical parameters of any vibrating object. A vibrating object will get the resonant frequency from complex excitation and would vibrate.
Answer:
B
Explanation:
During the Krebs cycle in the matrix of the mitochondria, H+ ions are usually pumped to the intermembrane space creating a proton-motive force. This potential difference is harness by ATP synthase to make ATPs as the H+ ions 'drain' back to the matrix of the mitochondria. As these H+ get to the matrix, they ultimately reduce oxygen to water. In this reaction, oxygen also acts as the ultimate electron acceptor in the Krebs cycle accepting 4 electrons from NADPH/ NADH (so these molecules can be recycled back as NAD+ and NADP+).
4H⁺ + O₂ + 4 ⁻e → 2H₂O