Traditionally the unit was the kilo-calorie but commonly just referred to as calorie. today's SI unit is the Joule...
Every fatty acids has a long hydrocarbon chain (with even amounts of carbons, usually 16 or 18) and a carboxyl group.
glycerol is a 3-carbon molecule with 3 -OH groups.
fatty accids and glycerol can be connected by single or double bonds, depending on if the fatty acid is saturated or unsaturated.
when a lipid forms, the -COOH functional groups of 3 fatty acids react with -OH groups of glycerol.
this leaves 16, 18, or 20 carbons, making a triglyceride 16, 18, or 20 carbons long.
hope this helps!
You would have multiple isomers:
C=c-c=c-c
C=c=c-c-c
C-c=c=c-c
Farming meant that people did not need to travel to find food.( nomadic lifestyles became scarce) Instead, they began to live in settled communities,or villages and grew crops or raised animals on nearby land. They built stronger, more permanent homes and surrounded their settlements with walls to protect themselves.
To line the airways and make mucus, which lubricates and protects the lung
There are numerous different cell types in the lungs. Epithelial cells make up the majority of lung cells. Mucus is produced by epithelial cells that line the airways and coat and shield the lung. Additionally, the lung cells contain blood, nerve, hormone-producing, and structural or supporting cells.
Air enters your lungs when you inhale (breath), and the oxygen in that air travels to your blood. A waste gas called carbon dioxide travels from your blood to your lungs at the same time and is exhaled (breathed out). Gas exchange is a procedure that is vital to life.
the bronchiolar epithelial cells, also known as airway cells, which are bordered with smooth muscle, and the alveolar epithelial cells, which make up the tiny sacs where gas exchange occurs
To learn more about epithelial cells in the lungs please visit
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