Help plz :)
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This is a scaffolding of protein fibers that us sell keep it shape in a cell division and cell movement

Some substances but not other can cross the (blank) membrane of a cell

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