The correct answer to this question is:
"Relative abundance is a comparison between the isotopes and Percent abundance is a comparing the totals." Relative<span> species </span>abundances tend to conform to specific patterns. Percent abundance <span> can be calculated by finding the percentage of an isotope compared to another isotope of an element using its relative atomic mass.</span>
Answer:
The first one is 2 and the second one is none of the above
Parallel structure is the use of the same grammatical structure in a text: the correct answer is A. It does not matter then whether this structure has articles, complex phrases or adverb-verbs, as long as the structure of two or more sentences is the same!
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