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Which system is made up of glands? circulatory system respiratory system endocrine system nervous system

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Answer:

Endocrine system is composed of glands that release insulin, a natural agent that breaks down sugars and glucose in the blood

Step-by-step explanation:

I took Heath

User EyasSH
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The endocrine system is composed of glands that release insulin, a natural agent that breaks down sugars and glucose in the blood. 
User Amsakanna
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