Sample A is very porous and has large amounts of gravel. Sample B is a mixture but contains mostly clay. Which would you expect to have the lowest permeability (or rate of drainage)? A) Sample A
B) Sample B
C) cannot be determined
D) equal permeability

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