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 fill in the blanks A, B, and C with appropriate terms that make the statement meaningful.

1. **Identify what is being exchanged**: The question mentions the exchange of something from the atmosphere with carbon dioxide produced by cells. In biological processes, cells produce carbon dioxide as a waste product during respiration. The substance that is typically exchanged with carbon dioxide is oxygen.

- **A**: Oxygen

2. **Identify the process**: The exchange of oxygen and carbon dioxide occurs during a specific biological process. The process where oxygen is taken in and carbon dioxide is expelled is known as breathing. This process is a part of a larger biological function.

- **B**: Breathing

3. **Identify the common name for the process**: The overall process that includes breathing and cellular respiration is commonly referred to as respiration.

- **C**: Respiration

Putting it all together, the completed statement is: "The process of exchange of **oxygen** from the atmosphere with `CO_2` produced by the cells is called **breathing**, commonly known as **respiration**."

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