elements that make up body weight
6 elements (make up about 98% of body weight of most organisms): Carbon Hydrogen Nitrogen Oxygen Phosphorous Sulfur Chemical basis of life: Small molecules ï  large molecules ï  cells ï  tissues ï  organs ï  organ systems ï  complex organisms 4 types of organic molecules (hydrogen): Carbohydrates- Ex.- monosaccharides, disaccharides, polysaccharides ...