Since the Ribosomes are often referred to as the "powerhouse" of a cell, the cell would basically shut down. And also the Ribosomes are the place where the proteins for a cell are made, so if the Ribosomes shut down, the cell won't have any proteins or energy to do all its processes.
Based on this information, it can be said that evolution of the frog's body is taking place through natural selection. This selection is based on how "fit" the frog is to his environment.
