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Biology; Chemistry; Physics: Post your doubts here!

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Some guys are saying we had to exclude the heating and cooling option,but that was for the water or the liquid yeast was to be put in right,i dont remember it exactly but i read it many times and i'm sure it didnt talk about heating with yeast in it.
but u see the coloured option had to be excluded as carbon dioxide would be made which would move the coloured solution to the right...so it had to be displaced to the left at the start to show movement....so urs was right....
 
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