 
<translate> Mmerụ ahụ́ ụbụrụ na-esite n'enweghị ikuku oxygen. Ịrịgo ugwu pụrụ ịkpata ụkọ ikuku oxygen. Ọ bụrụ na ikuku oxygen efunahụ ya, ọ na-akpata ọnwụ. Ọnwụ nke ikuku oxygen na-eme n'ụbụrụ. N'ihi ya, azịza ya bụ na ikuku oxygen na-apụ n'ahụ́ ya. <eng> Brain injury results from loss of oxygen. Climbing can result in loss of oxygen. Loss of oxygen is fatal. Loss of oxygen happens in the brain.
So, the final answer is loss of oxygen. 