Help me do thid

Solution 1.
A. the candle put off in picture B because all the oxygen present inside the container is used for combustion by the burning candle.
B. this activity proves that  oxygen is necessary for photosynthesis.
C. water will rise to that level where the imbalance in pressure created by the decreased air pressure inside container can be balanced.
D. we can infer from the activity that as the candle is extinguished, temperature of the air falls down inside the container which leads to increase in density and decrease in volume of the air, so the pressure of air inside the container decreases.
Solution 2.
A.  A is nitrogen, B is oxygen and C is carbon dioxide and other gases
B.  A is 78%, B is 21%, C is 1%
C. A. that is nitrogen is abundant in air and it does not support combustion.
D. Composition of air varies mainly due to the variations in temperature and pressure at different altitudes. 

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