Breathing is a physical process.

Breathing is mostly a chemical process. Say true or false.

Breathing is a physical process which includes certain stages. Choose the option which exhibits the stages involved in breathing.

Which of the following statements is/are correct about breathing?

Statement 1 - Breathing is a voluntary process.

Statement 2 - Breathing is a physical process.

Statement 3 - It is known as external respiration.

Statement 4 - Breathing is same as respiration.