Донце бочки (365). Дерево

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The human body is a complex and highly adaptable system that has evolved over millions of years to survive and thrive in a wide range of environments. It is composed of many different systems that work together to maintain homeostasis, the internal balance necessary for life. The nervous system, which includes the brain and spinal cord, acts as the control center of the body, sending and receiving signals to and from various parts of the body. The circulatory system transports oxygen and nutrients to cells throughout the body and removes waste products. The digestive system breaks down food into nutrients that can be absorbed by the body. The immune system protects the body against disease-causing microorganisms. The muscular system enables movement and supports the body's structure.