The human body is made of millions of such cells. Cell Level: A cell is the fundamental unit of life, and all creatures are made up of cells.Chemical level deals with the formation of molecules of protein, water, sugar, etc. Chemical Level: The living matter of a cell is made up of molecules from chemical elements such as hydrogen, carbon, oxygen, etc.The human body can be classified in terms of levels, which are mentioned below: The organ system works systematically to perform a set of specific functions. Some of the human organs work together as a system, which is called an organ system. The internal organs like the heart, lungs, liver, etc have a certain set of tasks to perform. ![]() The human body has different internal organs, protected inside the skeleton. The skeleton, which is made from bones and cartilages, gives shape and posture to the body. The human body contains a head, neck, four limbs attached to a trunk. The contraction and relaxation of the muscles cause the movement of limbs.
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