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Insects can be divided into two groups historically treated as subclasses: wingless insects, known as Apterygota, and winged insects, known as Pterygota. The Apterygota consist of the primitively wingless order of the silverfish (Thysanura). Archaeognatha make up the Monocondylia based on the shape of their mandibles, while Thysanura and Pterygota are grouped together as Dicondylia. The Thysanura themselves possibly are not monophyletic, with the family Lepidotrichidae being a sister group to the Dicondylia (Pterygota and the remaining Thysanura).

Insects are historically divided into how many groups?
Answer: two groups
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Montana has been a destination for its world-class trout fisheries since the 1930s. Fly fishing for several species of native and introduced trout in rivers and lakes is popular for both residents and tourists throughout the state. Montana is the home of the Federation of Fly Fishers and hosts many of the organizations annual conclaves. The state has robust recreational lake trout and kokanee salmon fisheries in the west, walleye can be found in many parts of the state, while northern pike, smallmouth and largemouth bass fisheries as well as catfish and paddlefish can be found in the waters of eastern Montana. Robert Redford's 1992 film of Norman Mclean's novel, A River Runs Through It, was filmed in Montana and brought national attention to fly fishing and the state.

What type of fisheries does the state have?
Answer: trout and kokanee salmon fisheries
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Gymnasts sprint down a runway, which is a maximum of 25 meters in length, before hurdling onto a spring board. The gymnast is allowed to choose where they start on the runway. The body position is maintained while "punching" (blocking using only a shoulder movement) the vaulting platform. The gymnast then rotates to a standing position. In advanced gymnastics, multiple twists and somersaults may be added before landing. Successful vaults depend on the speed of the run, the length of the hurdle, the power the gymnast generates from the legs and shoulder girdle, the kinesthetic awareness in the air, and the speed of rotation in the case of more difficult and complex vaults.

What is one thing a successful vault depends on?
Answer:
the length of the hurdle