Question

which step of cellular respiration does not require oxygen?

Explanation:

Cellular respiration has three main steps: glycolysis, the Krebs cycle (citric acid cycle), and oxidative phosphorylation (electron - transport chain). Glycolysis occurs in the cytoplasm and breaks down glucose into pyruvate. It can happen in the absence of oxygen (anaerobic conditions). The Krebs cycle and oxidative phosphorylation occur in the mitochondria and require oxygen (aerobic conditions) as the final electron acceptor in the electron - transport chain.

Answer:

Glycolysis