Ying: Homeostasis of an organism

Homeostasis refers to the steady-state physiological condition of an organism's body. All organisms have mechanisms and modes of maintaining balance in their internal environments. Maintaining a specific and constant body temperature in order to perform the necessaries functions for life is just one facet of maintaining homeostasis.

A Common Darter dragonfly (Sympetrum striolatum) in a modified "obelisk" position, a vertical posture that reduces its exposure to the sun's radiation in order to reduce body heat 

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A domestic dog (Canis familiaris) panting, a mechanism which helps the dog cool down by  breathing in cool air and removing excess heat from its mouth and tongue

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Source:  Campbell, Neil A., and Jane B. Reece. AP Edition: Biology. 7th ed. San Francisco: Pearson, Benjamin Cummings, 2005. Print.