What is the role of acetyl-coa? where does it fit into the krebs cycle?

acetyl CoA: Acetyl coenzyme A or acetyl-CoA is an important molecule in metabolism, used in many biochemical reactions. Its main function is to convey the carbon atoms within the acetyl group to the citric acid cycle (Krebs cycle) to be oxidized for energy production.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.