One of the factors that increases body heat during adaptive thermogenesis is the production of by skeletal muscle. this product causes leakage of protons from the intermembrane space of the mitochondria. uncoupling protein insulin glycogen glucagon

The answer is Production of organism, it happens in all warm-blooded animals, and also in a few species of thermogenic plants for example the Eastern skunk cabbage, the Voodoo lily, and the giant water lilies of the genus Victoria, the lodgepole pine dwarf mistletoe.  To keep the temperature up through shivering has only one method, it produce heat because of the conversion of the chemical energy of ATP into kinetic energy causing almost all of the energy to show up as heat.

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which fault and or fold did you find most difficult to diagram