Answer:
The answer is B: It is a tube lined with a mucous membrane.
Explanation:
The pharynx is a smooth tube approximately 12 cm long, which begins at the level of the neck and ends at the epiglottis, is related to both breathing and oral use; it is lined with a mucous menbrana; emits intelligible sounds, being the biggest resonator.
<h2>Question ❓: Briefly explain the nerve processes involved in an animal reacting to pain.</h2>
<h2>Answer❄️:</h2>
In the wild, hurt animals nurse their wounds, make noises to show distress, and even become reclusive. In the lab, researchers found that animals, like chickens and rats, self-administer pain relievers (from special machines set up for tests) when they're hurting.
People who become dependent on a drug may become tolerant to that drug. This means they need to use more and more of the drug to get the same effect or to avoid withdrawal symptoms. When people are dependent they believe they have to use the drug to do certain things or feel a certain way.
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:
a. Acne rosacea is a result of an infection and can be treated with antibiotics, while vulgaris is not caused by an infection
