Which of the followings is the more scientific definition of hormone? (a) They are extracellular...

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Which of the followings is the more scientific definition of hormone?
(a) They are extracellular messengers.
(b) They always act at distantly located target organs.
(c) They are the products of well organised endocrine glands.
(d) They are non-nutrient chemicals that act as intercellular messengers.
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