Adaptation. An adaptation is a feature that is common in a population because it provides some improved function. Adaptations are well fitted to their function and are produced by natural selection. vestigial structure is a feature that was an adaptation for the organism's ancestor, but that evolved to be non-functional because the organism's environment changed. Fish species that live in completely dark caves have vestigial, non-functional eyes.
1 A nurse administering Botox in a mall on average costs $9-$12 per unit, or $200-$300 per area (with 20-30 units), which can run $200-$600 for a typical treatment. Treatments may be every 3 months. 2  A nurse administering Botox in a mall on average costs $9-$12 per unit, or $200-$300 per area (with 20-30 units), which can run $200-$600 for a typical treatment.
Cost and Financing Information. The cost of BOTOXÂ® injectable treatment varies depending on the area of the country in which you are seeking treatment, and can vary slightly from physician to physician. The national average cost for these treatments, however, is around $375.ost and Financing Information. The cost of BOTOXÂ® injectable treatment varies depending on the area of the country in which you are seeking treatment, and can vary slightly from physician to physician. The national average cost for these treatments, however, is around $375.