Question

Write one word for the following.

1.	A thick blanket of air	....................................
2.	A gas that supports burning	....................................
3.	A gas that does not support burning	....................................
4.	Special organs for respiration in fish	....................................
5.	Addition of harmful gases and substances in air	....................................

Answer 1

1. Atmosphere
2. Oxygen
3. Nitrogen
4. Gills
5. Air pollution