Methyle orange is the indicator that is used in sulfuric acid.
Answer: 4.
and 
Explanation:
a) The given reaction is 
As the mass on both reactant and product side must be equal:


As the atomic number on both reactant and product side must be equal:



b) 
Total mass on reactant side = total mass on product side
15 =15 + x
x = 0
Total atomic number on reactant side = total atomic number on product side
8 = 7 + y
y = 1

Answer:
Cytoplasm.
Explanation:
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Answer:
orbiting closer to the earth's surface.....im pretty sure abt it
Nitrogen and oxygen are in unpolluted air