Notice here that the original strand has 6 bases, but the new one only has 5. Therefore, it has to be a deletion. Precisely, the A in the first sequence was deleted, and you can tell, because there should be a U in the fourth spot.
Aerobic respiration has higher energy production as glucose is fully broken down in restoring cells while anaerobic respiration is doesn't fully break down glucose and is used once the heart and lungs can't keep up with the capacity of oxygen needed for aerobic this usually happens during sprints in athletics
Some agree its in the billions range somewhere close to 3 billion.