ow does cellular respiration produce energy for living organisms and what are the
The process doesn't produce energy. Rather it converts chemical energy from a form perfect for transportation and storage into a form better suited to power cellular processes. It achieves this by turning glucose and oxygen into carbon dioxide and water like so: C6 H12 O6 + 6O2 → 6CO2 + 6H2O.

The oxygen and water molecules have less chemical binding energy than their products. This energy has been used to create the highly reactive ATP molecule. Try to think of it as a rechargeable battery that floats around in the cell randomly untill it hits a suitable socket. Almost every process in the cell that requires energy is being powered by ATP molecules. The Krebs cycle is a complex series of chemical reactions that use the chemical energy released when glucose is broken down and uses it to charge up ATP molecules. This is second stage of cellular respiration and is where "energy is produced" for the cell.