What I Have Learned Identify the following write your answer in your answer sheet. crystals. 1. The shell of an egg is made up of around percent calcium carbonate 2. It is also known as albumen. 3. It serves as the embryo's main source of nutrition. 4. A colorless structure primarily composed of protein fibers that surrounds the egg yolk. 5. A flattened white spot in a fertilized egg. 6. The most versatile nutritious and economical food is? 7. The protective outer covering of egg. 8. It contains protein. 9. Pocket of air formed at the large end of egg. 10. It is the major source of vitamins, minerals and fat.