Cardio is heart, because you heart pumps blood to the organs, tissue, and cells of your body.
Answer: b. Whether the article will have an accompanying commentary.
Explanation;
Commentary for the publication of manuscript involves the article along with which the manuscript is published. It is not mandatory for the publication of the manuscript. The chief editor of the journal invites the well known author or professional to comment on the manuscript by creating an additional article so that it may receive more attention from the readers.
Experiences
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I will try to give you the best answer by completing your statement.
During a marathon, approximately 99% of your muscles needs are met by the OES or Oxygen Energy System. Energy systems are the ones encharge of distributing the energy you need for a certain act.