Question

Which of the following statements are true?
1.Molecular hydrogen is used as the medium for the molecules in the body. 2.Molecular oxygen is used to break chemical bonds.
3.Molecular oxygen is used as the medium for the molecules in the body.
4.Water is used as the medium for the molecules in the body.

so, the answer are 2 and 4

Answer 1

The correct statements are STATEMENTS 2 AND 4.
Molecular oxygen is used to break chemical bonds in the body, for instance, during the process of cellular respiration, chemical substances are broken down in the presence of oxygen to produce energy for the living cells in form of ATP. Water is a universal solvent and it is the major fluid in the systems of living  organisms.