## [#  Biology of Marine Systems 

 ](/research-areas/biology-marine-systems-harvard-university)

Through a variety of laboratory, field, and model based studies Harvard faculty and students investigate unique aspects of the biology of marine organisms, and explore their relationships with the chemical and physical environment of the ocean, from the surface to the deep ocean floor and its sedimentary layers. These organisms are uniquely interesting in their own right, and research in recent decades has demonstrated the significance of marine organisms, from the smallest microbes to the largest mammals, in Earth’s biogeochemical cycles.