In order to explain the ecological approach in the learning process, we. present its underlying principles and analyse them in relation to existing learning design frameworks. To formalize. our approach, we define the basic concepts and propose a general framework for constructing learning paths.
Most women need 20-25 units for the treatment of frown lines. However, men may need 35 units because the bulk of muscle to be weakened is larger. BotoxÂ® prices nationwide average between $10 and $15 per unit.
1 By the vial or unit ($12 per unit, $15 per vial). 2  By the area, such as the area between the eyes, where frown lines are often treated with Botox ($450 â $800 for an area). By the vial or unit ($12 per unit, $15 per vial). 2  By the area, such as the area between the eyes, where frown lines are often treated with Botox ($450 â $800 for an area).