A weather front is a transition zone between two different air masses at the Earth's surface. Each air mass has unique temperature and humidity characteristics. Often there is turbulence at a front, which is the borderline where two different air masses come together. The turbulence can cause clouds and storms.
B. the frogs are a limiting factor for the gnats the frogs limit the reproduction of the gnats, and therefore with less frogs the gnat population can increase
