Explain why humans can be at different trophic levels on different food chains, but they can never occupy the lowest trophic level.

As a result of these processes the single celled organism accomplishes

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

Amino acids with hydrophobic r groups are most often found buried in the interior of folded proteins.true or false.