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Harmful mutations may cause genetic disorders or cancer. A genetic disorder is a disease caused by a mutation in one or a few genes. A human example is cystic fibrosis. A mutation in a single gene causes the body to produce thick, sticky mucus that clogs the lungs and blocks ducts in digestive organs.
Mutations arise spontaneously at low frequency owing to the chemical instability of purine and pyrimidine bases and to errors during DNA replication. Natural exposure of an organism to certain environmental factors, such as ultraviolet light and chemical carcinogens (e.g., aflatoxin B1), also can cause mutations.
only a small percentage of mutations cause genetic disorders—most have no impact on health or development. For example, some mutations alter a gene's DNA sequence but do not change the function of the protein made by the gene.
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In these situations, the nonavailability of safe water and sanitation facillities, more crowded areas of living, underlying health issues within the population and not being able to access as easily medical help can be a major factor in illness spreading more rapidly, along with any old water or mold and in extreme cases dead bodies that sit can cause more bacteria to grow and spread.
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first box is the third image, second box is the second image, third box is the fourth image, and the last box is the first image.
Explanation: my turtle told me
Could you please provide a picture of the table i would be happy to help.
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These tips can help you stop emotional eating, fight cravings, identify your triggers, ... We asked readers to share their hopes for 2021, and the response inspired us to ... Spending time with positive people who enhance your life will help protect you from the negative effects of stress. ... Monthly mental health & wellness tips.
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