why endocrine system evolved ?
sumitbhadauriya:
Endocrine System. During the evolution of life, singled-celled organisms developed into multicellular ones and these multicellular organisms became plants or animals. When animals got organs with diverse functions, they had to invent communication between these to establish homeostasis.
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True endocrine glands probably evolved later in the evolutionary history of the animal kingdom as separate, hormone-secreting structures. Some of the cells of these endocrine glands are derived from nerve cells that migrated during the process of evolution from the nervous system to various locations in the body.
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