Glycolysis is described as anaerobic because it:

1. Aerobic and anaerobic describe whether a pathway needs oxygen. 2. Glycolysis runs in the cytoplasm without any oxygen present. 3. The process does not use oxygen and is therefore anaerobic. 4. It certainly uses enzymes and water, so those options misread the term. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 7 'Cellular Respiration', sections 7.1-7.7_