Endocrine glands ________.
A. Do not have ducts to carry their product to a surface
B. Do not have ducts to retain their product below surface
C. Have ducts that carry their secretory product to a surface
D. Have ducts to retain their secretory product below surface
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http://www.emedicinehealth.com/anatomy_of_the_endocrine_system/article_em.htm
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http://www.emedicinehealth.com/anatomy_of_the_endocrine_system/article_em.htm