Answer:
To measure motion, you must be able to compare it to a reference point, or a non moving point.
Lactic acid produced by fermentation causes the sour taste.
The answer is A.the site on an enzyme where the substrate binds
Anaerobic respiration (without oxygen) would caused muscle cells to produce lactic acid. This causes the muscles to ache and in the long term, damages them. Also anaerobic respiration releases far less energy (ATP) than aerobic respiration. So it is best for muscle cells to respire aerobically as they need more energy.
