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.
BOTOXÂ® Injections Cost. updated. The average BOTOXÂ® treatment price ranges from $350 to $500 for each area injected. BOTOXÂ® injection cost can vary greatly according to geographic region and depending on the doctor who performs the procedure.For those on a budget, convenient BOTOXÂ® financing plans can make treatment easily affordable.n 2005, the national average cost of a BOTOXÂ® injection was just over $375. However, the cost of BOTOXÂ® treatment varies from area to area. In 2005, the northeastern United States had the highest BOTOXÂ® average cost, at just over $500, while the western states had the lowest average, at under $370.