One of the most fundamental activities of retailers is to provide satisfying the needs of their target market.

I guess there should be an options to choose as it's difficult to give accurate answer without it. But I think, I can give correct One of the most fundamental activities of retailers is to provide the right mix of merchandise and services, satisfying the needs of their target market. Retailers sell their goods directly to the customer, so it's important for them to keep customers satisfied and interested in their stuff.

The  atomic nucleus  is the small, dense region consisting of  protons  and  neutrons  at the center of an  atom, discovered in 1911 by  ernest rutherford based on the 1909  gold foil experiment.

Ineed the answer for the same quastion /: