Question

quiz: cellular respiration quiz
what does the oxygen do with the electrons that are passed to it at the end of the electron - transport chain?
release them to the environment
combine them with carbon to form carbon dioxide
return them to the beginning of the chain to be reused
combine them with hydrogen to form water

Explanation:

In cellular respiration's electron - transport chain, oxygen is the final electron acceptor. It combines with hydrogen ions ($H^+$) and electrons to form water. This is crucial for the production of ATP.

Answer:

Combine them with hydrogen to form water