Sentence:  Other THC activities followed , conducted by shopping centers , department stores , recreation equipment dealers , radio - TV stations , newspapers , and other organizations interested in the need <WSD>existing</WSD> to acquaint youngsters with the proper use of sporting firearms and the development of correct attitudes and appreciations related to hunting and wise use of our natural resources . 
Meaning of the word marked with <WSD> tags:  have an existence, be extant