The process of exchange of ……..A…….from the atmosphere with `CO_2` produced by the cells is called …….B……., commonly known as ………..C….. . Choose the alternative that will correctly replace A, B and C in the above statement and make it meaningful.

Options

A. `A - N_2, B` - ventilation, C - respiration
B. `A - NO_2, B` - breathing , C - combusion
C. `A - O_2, B` - breathing , C- respiration
D. A- water vapour , B - ventilation, C - combustion

Answer

To solve the question, we need to identify the correct terms that fit into the blanks A, B, and C in the statement provided.

1. **Identifying A**: The statement mentions the exchange of something from the atmosphere with `CO2` produced by the cells. In the context of respiration, the primary gas exchanged from the atmosphere is oxygen (O2). Therefore, A = **Oxygen**.

2. **Identifying B**: The process of exchanging oxygen from the atmosphere with carbon dioxide produced by the cells is known as breathing. This is the physiological process that allows for gas exchange. Therefore, B = **Breathing**.

3. **Identifying C**: The term commonly used to refer to the overall process that includes breathing and the cellular use of oxygen and production of carbon dioxide is respiration. Therefore, C = **Respiration**.

Putting it all together, the completed statement reads: "The process of exchange of **Oxygen** from the atmosphere with `CO2` produced by the cells is called **Breathing**, commonly known as **Respiration**."

### Final Answer:
A = Oxygen
B = Breathing
C = Respiration