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| Q: WHY DO VERTEBRATES HAVE AN ENDOCRINE |
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| SYSTEM? |
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| A: ALTHOUGH IT ALLOWS EXTREMELY RAPID COMMUNICATION
THE “HARD |
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| WIRING”
OF THE NERVOUS SYSTEM IS TOO
“EXPENSIVE”, INEFFICIENT (AND |
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| UNNECCESARY) FOR THE DELIVERY OF MOLECULAR SIGNALS TO
EVERY |
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| CELL
IN THE BODY. |
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