Name the gas which released by man during expiration?

Among the following which is an inert gas?

Windmills are used to produce______

Choose the equipment that work by air pressure?

Which gas is used in seriies of bulbs to import bright colours?

The gas used for respiration of living things is ______

People who dive into deep sea will carry a cylinder, what does it contain?

Identify the principle used to suck cool drinks using a straw?

Where the windmills are found is large numbers?

Hydrogen and oxygen combines to form___________