Which of these organisms lacks nervous tissue? jellyfish. sponge. nematode. earthworm.

Environmental impacts on evolution : mastery test

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

What do genes contain the code for?