Human body
Human Body The human body has several levels of complexity, at the very bottom of this hierarchical organization is the chemical level. at this level, tiny particles of matter, the atoms are the smallest thing ever, combine to form molecules like water and proteins. In turn, these molecules associate precisely to form various microscopic entities the organelles, which make up the cells , the smallest units of an organism live. Cells have dimensions and form very varied reflecting the diversity of their function in the body. The simplest organisms consist of only one cell, but in complex organisms like humans the tissue ...