Read a lot:
http://www.google.com/search?sourceid=navclient&aq=&oq=endocrine+glands&ie=UTF-8&rlz=1T4VRHB_enUS648US649&q=endocrine+glands&gs_l=hp..0.0i131j0l4.0.0.0.15119...........0.jY52IBmMzmY
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
1 answer