part of is part of part of ecosphere biosphere cmattin exposure_receptor ExO:0000032 ExO:0000031 2011-01-10T09:27:26Z MERGED DEFINITION:\nTARGET DEFINITION: An exposure_receptor that is the global ecological system integrating all living beings and their relationships, including their interaction with the elements of the lithosphere, hydrosphere and atmosphere.\n--------------------\nSOURCE DEFINITION: An exposure_receptor that is the part of the environment that is made or modified by humans for use in human activities and human habitats. anthrosphere