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It is advantageous for animals to have both a nervous system and an endocrine system because they serve different functions. The nervous system allows for rapid, short-term responses to stimuli, while the endocrine system regulates slower, long-term processes such as growth and metabolism. The nervous system relies on electrical signals and neurotransmitters, while the endocrine system uses hormones to communicate between cells. Hormones are able to travel through the bloodstream to affect distant target cells, while neurotransmitters act locally on adjacent cells. By having both systems, animals are able to respond to a wide range of stimuli and maintain homeostasis in their internal environment.
