What do aerobic respiration and anaerobic respiration have in common?

Glycolysis.

Explanation:

Aerobic respiration involves complete breakdown of glucose molecule in the presence of oxygen to release 36 molecules of ATP.  On the other hand, anaerobic respiration involves partial breakdown of glucose molecule, when oxygen is absent to release only two molecules of ATP.

Glycolysis is a universal process as it is common in both aerobic and anaerobic respiration. It does not require oxygen and can occur in both presence or absence of oxygen. Glycolysis forms two [pyruvate molecules, two ATP molecules. along with two NADH molecules from one glucose molecule.

Thus, the correct answer is 'glycolysis.'

chordata is the answer

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).