Due to overfarming a field, the soil has become unsuitable for growing crops and is now covered with weeds. even the worms which would have been in restoring the soil's fertility, are gone. which interference most likely occurred

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