How does a positive feedback loop respond to changing conditions? a it counteracts a variation from a set point. b it increases a change away from a set point. c it changes a set point to match current conditions. d it reduces any change that overwhelms a set point.

Can happen anywhere along the spine if the neural tube does not close all the way. the backbone that protects the spinal cord does not form and close as it should. this often results in damage to the spinal cord and nerves. a) cleft palate b) spina bifida c) encephalocele d) down's syndrome