Question

Some organisms obtain energy and nutrients from plants in an ecosystem. These organisms have energy stored in their bodies. What happens to the energy in the ecosystem when the organisms die?Some is used by decomposers, and some is released into the environment as heat.Energy from the organisms is destroyed along with the nutrients they contained.
Bacteria release energy from the dead organisms in the form of radiant energy.
The total amount of energy in the universe decreases at the moment the organisms die. 
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Answer 1

The answer to this question would be Some is used by decomposers, and some is released into the environment as heat.

When an organism died, decomposer can degrade some of its remaining corpses and use the produced energy. Some of the parts can't be degraded like bones.
The total energy should not be decreased as it was opposing the law of conservation of energy.

Answer 2

Answer:

A. Some is used by decomposers, and some is released into the environment as heat.