Here's why:

* Anaerobic processes occur without the presence of oxygen.

* Metabolic processes that require oxygen are called aerobic.

Think of it like this:

* Anaerobic is like a car running on fumes - it can get you somewhere, but it's not efficient and doesn't work well for long periods.

* Aerobic is like a car running on a full tank of gas - it's efficient, powerful, and can go much further.