Fat stored in the body is used as a source of energy when not enough energy is available from food. this process involves: a. using fatty acids that are available in the cell's lipid layer. b. transporting cholesterol to the muscles to be broken down for energy. c. converting glucose into fat as a more efficient method of producing energy. d. dismantling stored fat in fat cells and releasing components into blood. e. retrieving fatty acids that have been stored in the liver.

d. ​dismantling stored fat in fat cells and releasing components into blood.

Explanation:

Fat is a biomolecule which is concentrated as a source of energy. It is provides more than twice the potential energy as compared to proteins or carbohydrates. When the body experience the lack of energy and not enough energy is available from food source then the stored fat in triglycerides are broken into fatty acids and releasing the components into the blood.

americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.