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.
1 A dermatologist or plastic surgeon administering Botox at a medical office on average costs $14-$17 per unit of Botox, or $600 to $1,200 or more for multiple areas.omments (5). Costs for Botox can vary significantly based on how much an individual needs and wishes to get, and based on who is administering it. Some skin care centers advertise low prices for Botox on a cost per area basis, advertising prices of $200-$300 for one area.