The Krebs cycle<span> occurs right after glycolysis. The substance that begins the </span>Krebs cycle<span> is a 3-carbon molecule called pyruvic </span>acid<span>. The process breaks down the pyruvic </span>acid<span> into acetyl coenzyme A, releasing one of the carbon atoms into carbon dioxide.
hope it help</span>
Biotic= living like trees, animals,
The tissue called "epithelial" is responsible for secreting digestive enzymes.
A because only an element is there which is H