Most bony fishes have two sets of jawsmade mainly of bone. ... They do not have pharyngeal jaws. Generally jaws are articulated and oppose vertically, comprising an upper jaw and a lower jawand can bear numerous ordered teeth.
The answer is; genetic diversity
Genetic diversity is the number of genetic characteristics in a population. Genetic diversity is important in a population especially in its adaptability to a changing environment. The diversity is acted upon by natural selection and enables the population to evolve with the changing environment.
I would say A.B.C but it might not be the answer
The part of the river that would have animals with very muscular bodies and adaptations that survive in turbulent water is the transition zone.
