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.
Dr. Kristin Eagan, M.D. The average cost for a round of BotoxÂ® is about $500, but the specifics will obviously vary a lot from patient to patient. Some patients pay as little as $200 and some pay upwards of $900.This gap in the price range depends on lots of factors such as:otoxÂ® prices nationwide average between $10 and $15 per unit. If it takes 25 units of BotoxÂ® to weaken or paralyze the frown and laugh muscles, you could expect to pay $250 to $375 for it. If it takes 75 units of BotoxÂ® to weaken forehead muscles, you could expect to pay $750 to $1,125 for it.
Prices do, however, vary, and a single vial of Botox can cost up to $1000 in some cases. A single vial of Botox can cost up to $1000! Prices are charged based on the amount of units that are used. A single unit usually costs $10 to $20, with 20-30 units being needed per area on average.