_____10.Which situation shows the presence of oxygen in a materials?
I. Lighting of a candle
II. Burning of fuels
III. Combustion of enginess
IV. Putting off a lighted candle
a.I, II and III
b.I and IV
c.I and II
d.all of the above
I. Lighting of a candle
II. Burning of fuels
III. Combustion of enginess
IV. Putting off a lighted candle
a.I, II and III
b.I and IV
c.I and II
d.all of the above
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B. I and IV
Because when the candle is put off or lighted it can be blown by the air or just put off the fire on its own