Barter is a system of exchange where goods or services are directly exchanged for other goods or services without using a medium of exchange, such as money
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.
Negative: news blogging can put journalists out of jobs.
Positive: news blogging can get factual news quicker than traditional news outlets by real people who have witnessed the event.
