Here's why:

* Replication is the process of copying DNA, a crucial step in cell division. While it does require energy (provided by ATP), it doesn't directly involve an energy-releasing process.

* Energy-releasing processes that don't require oxygen are called anaerobic respiration or fermentation. These processes are used by some organisms to obtain energy in the absence of oxygen. Examples include:

* Glycolysis: The initial breakdown of glucose, which occurs in both aerobic and anaerobic respiration.

* Lactic acid fermentation: Used by muscle cells during intense exercise.

* Alcoholic fermentation: Used by yeast to produce ethanol and carbon dioxide.

Therefore, replication itself is not an energy-releasing process that doesn't require oxygen.