If it is the abdomen and not the stomach area i would say its from the heat. if you've ever seen a dead animal on the side of the road over the course of a few days, they start to swell from the sun beating down on them all day.
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RoHS applies to the following substances for electronic equipment and electrical appliances: lead, mercury, cadmium, hexavalent chromium, PBB (polybrominated biphenyls), and some PBDEs (polybrominated diphenyl ethers).
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When scientists conduct an experiment and analyze the results, the next step is to write up a report that describes the experiment and the results and submit it for publication in a scientific or medical journal that is “peer reviewed.”
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the answer for this is B.