Simple sugar dehydration–fragmentation products, such as derivatives of furans, pyrones, cyclopentenes, carbonyl compounds, or acids
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Answer:
difficult
Explanation:
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Answer:
The first line of defence includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils.
Explanation: