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

The best and most correct answer among the choices provided by your question is the first choice or letter A. Endocrine glands do not have ducts to carry their product to a surface.

Endocrine glands are glands of the endocrine system that secrete their products, hormones, directly into the blood rather than through a duct. The major glands of the endocrine system include the pineal gland, pituitary gland, pancreas, ovaries, testes, thyroid gland, parathyroid gland, hypothalamus and adrenal glands.

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