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.
Breaking Down the Cost of Botox. OK, so back to the question. Does Botox cost $15 or $800? First, the basics. Botox is a brand name for the Botulinum toxin Type A, which is used to relax facial muscles, thus reducing lines and wrinkles in cosmetic uses. It can also be used to ease migraines, excessive sweating and a few other conditions. When Botox is injected, it is priced two different ways: By the vial or unit ($12 per unit, $15 per vial) By the area, such as the area between the eyes, where frown lines are often treated with Botox ($450 â $800 for an area)