Marine Biology is the study of sea-dwelling organisms with respect to any aspect of their biology, including ecology, physiology, behavior, reproduction and development, conservation, and evolution. Representatives of every group of microbes, plants, and animals on Earth live in the sea, and many marine organisms serve as 'model organisms' for studies in cell biology, developmental biology, biomechanics, and other sub-disciplines of biology. Marine organisms are prominently featured in natural product pharmaceutical development and biotechnology.