The skin shields the body from external conditions and aids in the regulation of the body's internal functions as part of the integumentary system.
The integumentary system is a collection of organs that make up the body's outermost covering. It is made up of the skin and its appendages, and it serves to protect and preserve the animal's body by functioning as a physical barrier between the exterior and interior environments.
The excretory system's skin, on the other hand, acts as a regulator for the amount of fluids and salt in our bodies.
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