What are the uses of oxygen?

Question

Uses of oxygen

Answer 1

Oxygen is combined with hydrogen to form a hot flame used in welding metals
Used for breathing by hospital patients
Used by mountain climbers and undersea divers for breathing
Used in fuel and fuel cells

Answer 2

Air enriched with oxygen is used in hospital by patients with breathing problems.

Answer 3

Air enriched with oxygen is used in hospital by patients with breathing problems.

Answer 4

For climber

Answer 5

Combustion- air enriched with oxygen supports burning

Answer 6

For burning
For germination
For breathing 

Answer 7

Is used in hospitals
Is used by the diver in deep sea

Answer 8

For burning
For germination

Answer 9

Used to burn fuels eg petroleum
Oxygen is used to remove impurities from metal

Answer 10

Helps in breathing
Used in germination
 Used in combustion
Used in decomposition