The Earth's escape velocity Illustration Play

The Earth's magnetic field Illustration Play

The Earth's tilt Illustration Play

The effect of temperature on photosynthesis Illustration Play

The electron microscope Illustration Play

The electronegativity concept Illustration Play

The elementary particles Illustration Play

The enzyme-substrate complex Illustration Play

The exponential law of decay Illustration Play

The framework of a blood clot Illustration Play

The full Moon and the third quarter Illustration Play

The gas isobar Illustration Play

The gas isochor Illustration Play

The gas isotherm Illustration Play

The graph for a second-order reaction Illustration Play

The graph of a first-order reaction Illustration Play

The greatest flu epidemic Illustration Play

The growth curve for organisms Illustration Play

The H-R diagram Illustration Play

The heart never "tires" Illustration Play

The hormonal contraceptives Illustration Play

The human muscular system Illustration Play

The human skeletal system Illustration Play

The importance of carbon dioxide in photosynthesis Illustration Play

The importance of water in photosynthesis - experiment Illustration Play

The influence of age on eye diseases Illustration Play

The isotopic composition and mass spectrum of an element Illustration Play

The kidneys and urinary system Illustration Play

The large intestine Illustration Play

The largest copper mines Illustration Play