Taking a gain in weight to be positive, write each change in weight using positive and negative numbers a, john is 2 kg heavier than before b,mary is 3 kg lighter than before
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Science shows that genetics plays a role in obesity. Genes can directly cause obesity in specific disorders such as Bardet-Biedl syndrome and Prader-Willi syndrome. However genes do not always predict future health. Genes and behavior may both be needed for a person to be overweight.
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