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The correct answer would be the second option. The correct plan for his experiment would be that the temperature, the type of limestone, and the type of acid are controls. The amount of acid and the amount of damage to the limestone are variables. To determine the degree of damage of the acid it would be best that the amount of acid is the manipulated variable while everything else are assumed constant.
Answer:
Unfortunately you are dealing with the credibility of a non credible source. The United States government has proven itself to be untrustworthy and untruthful many times, and continues to do so. Once the United States government (and many others) become more truthful, things like the moon landing will become much easier too believe.Explanation:
Answer:
Answer is C, were directed to the imperial powers in Europe and Asia.
Explanation:
The "Open door notes" which was initially known as the "Open door policy" , was created or proposed in 1899 by John Hay who was the the secretary of state.
The aim or purpose of the policy or note was that the Chinese market should be open to all parties, that is , countries. This means that , no particular country should gain or have total control over that region.
It should be noted that during that time, there was intense competition to exert control over China among the countries in America and Europe. This is because, at that time the Chinese government was not that strong.
Then , the open door policy or note was created to avoid or prevent conflict that may arise or occur over the Chinese market.