The nonrenewable energy source that comes from dead organisms is fossil fuels.

Here's why:

* Fossil fuels (coal, oil, and natural gas) are formed over millions of years from the remains of ancient plants and animals.

* These organisms died and were buried under layers of sediment, where heat and pressure transformed them into hydrocarbons.

* Because they are formed over such long periods, fossil fuels are considered nonrenewable resources.