In the last 250 years, the amount of carbon in the air has increased by percent. options:

10%

40%

80%

stayed the same

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