Natural selection is a fundamental mechanism driving the evolution of species. to research this conclusion a group of scientist want to test the effects of increased river salinity on a population of catfish in a river. what results from this experiment would confirm that natural selection is a process that can drive evolution

4. multiple crosses were made between true-breeding lines of black and yellow labrador retrievers. all the f1 progeny were black. when these progeny were intercrossed, they produced an f2 consisting of 91 black, 39 yellow and 30 chocolate. a. propose an explanation for the inheritance of coat color in labradors. b. propose a biochemical pathway for coat color determination and indicate how the relevant genes control coat coloration.