In animals, some materials and energy are lost to the environment in the waste they produce, including the carbon dioxide from respiration.
Some available energy goes into:
- Growth
- Production of offspring
This energy becomes available to the next stage. All energy eventually goes back into the environment.
However, most energy is lost through:
- Respiration
- Movement
- Life processes
- Eventually lost as heat to the surroundings
- Waste materials
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