Name the following :
The "Natural purifiers" of the air.

Name the following : The physical process by which air is taken in and forced out of the lungs.

Name the following : The process of heating an ore to a high temperature in the presence of air.

Name the following. The microscopic air-sacs of the lungs

Name the following: The process of heating an ore to a high temperature in the presence of air.

Name the following The physical process by which air is taken in and forced out of the lungs

Name the following The process of heating an ore to a high temperature in the presence of air.

Name the following: The Vehicular Standard for controlling air pollution.

Name the following: A gradual and orderly changes in nature.

Name the following: The undigested cellulose which is fibrous in nature.