Which distinguishing structures of a eukaryotic cell or part of the internal membrane system
b

Eukaryotic cell distinguishes from prokaryotic cell based on the part of internal member system are Golgi bodies, endoplasmic reticulum, nuclear membrane and vesicle which are absent in prokaryotic cell.

Explanation:

Due to presence of nucleus, the eukaryotic cell can perform specialized functions that the prokaryotic cells don’t. They also store their DNA in nucleus in the form of chromosomes.

Golgi bodies helps in processing of proteins. Whereas the endoplasmic reticulum helps in synthesis of protein as well as folding and transport of protein.

i think the answer is a.keratin is the pigment responsible for skin color.