Adults with presbycusis may have difficulty in discriminating fricatives because they have fewer functional nerve cells in the inner ear, which makes the inner ear work harder to process and transmit sound when background noise is present.
This indicates that the inner ear and brain are not effectively communicating with one another.
Presbycusis is the gradual hearing loss that most people experience as they age.
An age-related disorder that is common is hearing loss.
A hearing loss affects 30-35 percent of persons over 65. A hearing loss affects 40–50% of adults aged 75 and older, according to estimates.
Its primary symptom is trouble discriminating fricatives from background noise as the inner ear has to work harder to process and transmit sound when background noise is present because they have less functioning nerve cells.
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Answer:
Conversion of alcohols to alkenes: R-CH2-CHOH-R → R-CH=CH-R + H2O
Conversion of carboxylic acids to acid anhydrides 2 RCO2H → (RCO)2O + H2O
Explanation:
Dehydration
In chemistry, a dehydration reaction is one that involves the loss of water. In organic synthesis, where an acid is often used as a catalyst, there are numerous examples of dehydration reactions: Conversion of alcohols to ethers: 2 R-OH → R-O-R + H2O Conversion of alcohols to alkenes: R-CH2-CHOH-R → R-CH=CH-R + H2O Conversion of carboxylic acids to acid anhydrides 2 RCO2H → (RCO)2O + H2O Conversion of amides to nitriles: RCONH2 → R-CN + H2O
Sources:
Klein Organic Chemistry. 2th edition
Mcmurry's Organic Chemistry. 9th edition.
Answer:
The correct answer actually type one diabetes that relates to such.
