Endocrine glands
A. lack ducts and secrete their products onto the skin surface.
B. secrete mucus directly into a body cavity.
C. possess ducts to secrete their products into the bloodstream or into interstitial fluid.
D. lack ducts and secrete their products into the bloodstream or into interstitial fluid.
E. possess short ducts and secrete their products directly onto the skin surface.
Answer: D
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