In the case of biological magnification, organisms that are higher on the food chain
have proportionally higher concentrations of the substance than do organisms that are lower on the food chain.

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