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Animals are almost the same as human in energy transformations. They change food into thermal and mechanical energy. Due to this constant temperature is maintained in a body and animals are able to move.
First, an ecosystem needs energy to work. Just like the computer you are using to read this, an ecosystem cannot function without energy. In many ecosystems, energy first enters the ecosystem from the sun. You may have heard of solar-powered electricity. Well, many ecosystems are also solar-powered.