2. 1)A spare energy: to provide the heat we needed 2)To keep the body temperature 3)One of the composition of the cells 4)To dissolve Vitamin A, D, E and K 5)The provider of some kinds of fatty acid 6)Increasing the deliciousness of food

3. As nonpolar compounds, fats could be stored without water. And compared with other kinds of spare energy, fats require less space. The picture shows the fats in an animal cell

4. More and more studies show that a kind of fats called brown fats could maintain the body temperature. More brown fats could make homeothermal animals shake less when they are exposing to cold environments. On the other hand, fats are good buffers for collisions.

5. Phospholipids are a class of lipids that are a major component of all cell membranes as they can form lipid bilayers. Most phospholipids contain a diglyceride, a phosphate group, and a simple organic molecule. Picture: a model of phospholipid

6. A group of vitamin called lipid-soluble vitamin can only dissolve in lipids such as fats. The lipid-soluble vitamin includes Vitamin A, D, E and K. They must dissolve in lipids before absorbing by animals.

7. 1)Improving the function of brain, improving memory (make you more intelligent! ) 2)To regulate the metabolism

8. We usually take in fats from animal oil and vegetable oil. Many kinds of food such as nuts, meat, fish and milk. But we should know that fats is the reserved energy. It can be transformed from other substances. It means you can take in fats without eating it.

10. Keep in mind that we only need 27g fats one day, too more or too less are bad for our health.