American ships became targets of attack by 1917 because Americans continued to trade with the warring nations.
At that time, the american vowed that we adopt a non-interventionist policy during the war time. But when we continue to trade with warring nations, other nations viewed it as we supplying materials and supplies to one of the nations that involved in the war. This is why american ships became targets of attack.
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Increase ice on is mya
First you should know that a dependent variable is the one which its values depends of the ones of other variable. In this case, <em>the final mass is the dependent variable</em> because this amount directly depends on how much acid the scientist pours in the initial mass to increase or decrease it. This is also why she remeasures it once the experiment is done.
