sentences: excretion is when the excretory system removes waste from the body
docs: urinating is excreting. kidney is excretory_organ. exuding is excreting. excreting is bodily_function_event. evacuating is excreting. animal_excreting is excreting. house_cat_excreting is excreting. crap is excreting. excretory_organ is internal_organ. excrescence is process.