The second stage of cellular respiration is
the calvin cycle
the krebs cycle
the electron transport process
glycolysis

Answer;

-Kreb's cycle

Explanation;

-Cellular respiration is the process by which organisms utilize organic molecules such as simple sugars (glucose) to form or generate energy in the form of ATP, and water and carbon dioxide as by products. Energy in the form of ATP may be stored or used by the cell to drive cellular processes such as transport and growth.

-Cellular respiration takes place in three stages; namely; glycolysis, Krebs cycle and electron transport chain.

-The Krebs Cycle takes Citric Acid which is a derivative of Pyruvic Acid and converts this through 4 cycles into Hydrogen, carbon dioxide and water in the Mitochondrial Matrix.

"griffith's experiment discovering the "transforming principle" in pneumococcus bacteria. griffith's experiment, reported in 1928 by frederick griffith, was the first experiment suggesting that bacteria are capable of transferring genetic information through a process known as transformation." - griffith's experiment.

answer; ///(b) it is composed of four protein chains and four heme groups;