Cords of billroth are found in `:`

Among the following stem cells, which are found in umbilical cord:

Identify the scientist. ' They worked on the structure of spinal cord and found that it has two roots, one is on the drosal side and the second one is on the ventral side'.

Name the two enlargement found in spinal cord.

In hemichordates the dorsal nerve cord is

In hemichordates the dorsal nerve cord is