Adoctor is exploring some tissue with a blunt probe. she notices that the tissue is white and fatty and seems to be concentrated within the spinal cord. she is observing
select one:
a. cerebrospinal fluid
b. motor nerves
c. myelin sheaths

White matter is white because it is covered with a fatty protein called myelin. So yes, the answer is c :)

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

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