H-shaped area of the spinal cord is called matter and it is located around the filled with cerebrospinal fluid.

The correct answer is "grey; central canal".

Explanation:

Grey matter refers to an area of the brain, brainstem and cerebellum comprised of unmyelinated neurons and other cells that has given its name for having a pinkish-grey color in the living brain. Grey matter is also present in the spinal cord in an are of three grey columns that are H-shaped and it is located around the central canal filled with cerebrospinal fluid

the real answer is b. scintillation counter

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.