Answer:
The endocrine system produces hormones that are transported to the target regions by the circulatory system.
The Circulatory System delivers oxygen and nutrients in the blood to the surrounding cells to maintain Homeostasis. The blood in the Circulatory System is needed throughout the body so that other systems work properly. Like for instance the Nervous System has the brain, and the brain needs blood to function.
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Roger is studying how energy from the Sun changes to chemical energy in plants and to mechanical energy in animals. He is studying thermodynamics.
Dendrites branch from the body and axons send the message