Q: What materials do glands release from under your skin to the surface of your skin?  

Answer: C

There are several types of glands present in the skin, including sweat glands and sebaceous glands. Sweat glands release sweat, which is a watery fluid containing salt and other substances, onto the surface of the skin. Sweat helps to cool the body and also contains trace amounts of waste products. Earwax, which is produced by ceruminous glands in the ear canal, helps to protect the ear by trapping dirt and other foreign particles.
Sebum is produced by sebaceous glands and helps to lubricate and protect the skin and hair. Urine and feces are excreted from the body through the urinary and digestive systems, respectively. Blood and lymph are fluids that circulate through the body, but are not released from under the skin to the surface.

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