sentences: cellular ecosystems is a sink of matter for room inactivity
docs: cerium_iv_ion is variable_charge_cation. demilitarized_zone is unnatural_thing. cellular_compartment is spatially_bounded_thing. cellular_compartment is spatial_thing. limbic_system is solid_object. spinal_fluid is organic_matter. subcellular_compartment is spatially_bounded_thing. cellular_compartment is microscopic_object. biological_absorption_event is organic_event. cellular_compartment is organic_matter.