Final answer:
In the case of hypoxia due to inadequate delivery to the brain, the most common wave is the theta wave.
Step-by-step explanation:
Hypoxia, which is the decreased supply of oxygen to the tissues, commonly accompanies ischemia, a condition where there is insufficient blood flow. In the case of hypoxia due to inadequate delivery to the brain, the wave that is most common is the theta wave. Theta waves are lower in frequency and higher in amplitude than alpha waves, and they are associated with an increase in theta wave activity in stage 1 sleep.