<em>An</em><em> </em><em>isotope</em><em> </em><em>is</em><em> </em><em>an</em><em> </em><em>element</em><em> </em><em>having</em><em> </em><em>same</em><em> </em><em>atomic</em><em> </em><em>no</em><em> </em><em>but</em><em> </em><em>different</em><em> </em><em>mass</em><em> </em><em>no</em>
<em>Ex</em><em>:</em><em>chlorine</em>
Yes, I think that identifying the purpose would increase the credibility of the source, so if we understand the "should" here as "would be good if, is recommended" - then this statement is true.
Including the intent of the information in the source will help place the information in a wider context - and often the context is necessary to fully understand the content of a source.
The most of the mass in the solar system is located in the sun - and in fact it's as much as 99% of all the mass in the system!
Trappers faced attacks from indians and or wild animals. they also faced dangerous weather such as snow, sleet, and dangerous winds.
