Who am I

Humans produce me,plants need me for photosynthesis,who am I ?

Plants produce me,Humans need me,who am I ?

Without me, There's no life. Who am i?

I own 78%% of air, Who am i?

When it's small it became your friend,when it's big it became your enemy,who am I ?

Answer explanation

I am a mixture of nitrogen, oxygen,carbon dioxide and inert gases, who am I ?

I own 0.03% of air,Who am I ?

Answer explanation

I am a type of material that uses wood,cloth and paper to put out a fire,who am I ?

Answer explanation

I am used to fill hot air balloons and weather balloons,who am I ?

I am one of the gases that exist in the air and I am used in light bulbs,who am I ?