Answer: When permafrost is frozen, plant material in the soil—called organic carbon—can't decompose, or rot away. As permafrost thaws, microbes begin decomposing this material. This process releases greenhouse gases like carbon dioxide and methane to the atmosphere.
Explanation:
The answer to this is: Assumptions or Inferences<span>
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The answer is, "were". I hope this helps.
If the underlined sentence is "so that he could learn new skills and serve his country", then it is a subordinate sentence, meaning that it cannot exist on its own, it has to be a part of a larger, independent sentence.
