Final answer:
Lipids are the organic compounds that can be dissolved and stored in the liver and fatty tissues, with triglycerides being a common form that serves as long-term energy storage.
Step-by-step explanation:
The organic compound that can be dissolved and stored in the liver and fatty tissues is known as lipids. Lipids, which include fats, oils, and triglycerides, function as a long-term storage form of energy in organisms. Triglycerides are made up of long carbon chains, making them nearly nonpolar molecules that do not dissolve readily in polar solvents like water, but they are highly soluble in nonpolar organic solvents. The liver not only stores lipids but it also stores essential vitamins such as A, D, B12, and K, and it has a crucial role in synthesizing important proteins and lipids.