It is a controlled experiment as everything is the same apart from one variable
The answer is A.) Layers
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neutralisation is the process of converting an acid or a base into the pH value 7.The 2 things produced r hydrogen gas and a salt.
acid+base=salt+hydrogen gas.This often occured in your stomach. when you have gastroble you are eating tablets which are base and a reation take place with hydrocloric acid in it
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Free Energy is found in atp and cell membrane
It helps classify animals according to their needs.
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-Payshence xoxo