Biles is the 2013 U.S National Champion and is a first year senior elite gymnast.
Ross and Maroney were members of the gold medal winning Olympic team in London.
Dowell placed third at this year’s U.S National Championships and placed ninth at last year’s Olympic Team Trials.
This year’s World Championships will be held in Antwerp from September 25 to October 7. It is an individual Worlds, meaning there is no team competition. Only the individual all-around and apparatus finals will take place.
Biles and Ross could win medals in the all-around as well as on vault and uneven bars, respectfully.
Maroney won silver on vault at the 2012 Summer Games and could win gold this year. If she does, she will be the first American gymnast to win vault twice at a World Championships.
Dowell could win a medal on floor exercise and possibly compete in the all-around.