Answer:Argon is the third noble gas, in period 8, and it makes up about 1% of the Earth's atmosphere.
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There will be more acid particles to interact with the limestone at higher concentrations hence the rate of reaction increases.
The question is incomplete but I will try to help you the much I can. If you have carried out the experiment properly, you will notice that the rate of reaction increases as the concentration of the acid increases.
This is because, if the amount of limestone is held constant and the concentration of acid is increased, there will be more acid particles to interact with the limestone at higher concentrations hence the reaction proceeds faster.
Learn more about rate of reaction: brainly.com/question/8592296
Its both lowercase genotypes so it would be aa because if it was Aa you would be a carrier but not have the sickness