Question

the concentration of carbon dioxide inside the greenhouse can be increased by using the exhaled air from individuals. bunsen burners. outside co₂ supplies. paraffin heaters.

Explanation:

• Exhaled air from individuals: Humans exhale \( \text{CO}_2 \), so using exhaled air can increase \( \text{CO}_2 \) in the greenhouse.
• Bunsen burners: Combustion of fuel in Bunsen burners produces \( \text{CO}_2 \) (e.g., burning natural gas, which is hydrocarbon - \( \text{C}_x\text{H}_y + \text{O}_2

ightarrow \text{CO}_2+\text{H}_2\text{O} \) when complete combustion), so this can increase \( \text{CO}_2 \).

• Outside \( \text{CO}_2 \) supplies: Directly adding \( \text{CO}_2 \) from external sources will increase the concentration inside the greenhouse.
• Paraffin heaters: Paraffin is a hydrocarbon (\( \text{C}_n\text{H}_{2n + 2} \) - like structure). When paraffin burns (\( \text{C}_n\text{H}_{2n+2}+\frac{3n + 1}{2}\text{O}_2

ightarrow n\text{CO}_2+(n + 1)\text{H}_2\text{O} \)), it produces \( \text{CO}_2 \), so this can increase \( \text{CO}_2 \) concentration.

Answer:

All options are correct:

• the exhaled air from individuals.
• bunsen burners.
• outside \( \text{CO}_2 \) supplies.
• paraffin heaters.