digestive system - breaks down food into nutrients the body can use, absorbs those nutrients into the bloodstream, and eliminates waste., circulatory system - transport oxygen, nutrients, hormones, and other vital substances to the body's cells and organs, while simultaneously removing waste products like carbon dioxide., excretory system - to filter waste from the blood and maintain homeostasis by regulating water, salt, and ion balance, respiratory system - facilitate gas exchange, bringing oxygen into the body and removing carbon dioxide, immune system - a complex network of organs, cells, and proteins that protects the body from illness and infection,

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