What is the significance in regenerating NAD+ in fermentation?

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of

In general, are there any major differences that you can see? explain

The carrier molecules of the electron transport system are located in the