An energy-rich organic compound needed by organisms is
Answer and Explanation:
In order for a compound to be organic it must contain a very important element: Carbon. This can eliminate choices 1 and 3 since the formula for water is H2O and oxygen is O2. A compound that is rich in energy is glucose, choice 4. The formula for glucose is C6H12O6. Animal bodies break down glucose in a process called glycolysis to create energy in the form of ATP molecules. Therefore, glucose is an essential and necessary compound for our survival.