* Cells cannot create their own organic molecules from scratch. They lack the ability to convert inorganic matter (like carbon dioxide and water) into the complex organic molecules they need for fuel.
* Organic molecules store chemical energy. These molecules, like carbohydrates, fats, and proteins, contain chemical bonds that hold significant amounts of energy.
* Cellular processes require energy. Everything a cell does, from building new molecules to transporting substances across its membrane, requires energy. This energy comes from breaking down the chemical bonds in organic molecules.
In summary: Cells are like engines that need fuel to run. They get their fuel (organic molecules) from outside sources, either by consuming other organisms (heterotrophic) or by converting sunlight into energy (autotrophic).
