What part of cell acts like a border patrol?

I think it is phosholipid

Explanation:

From what I know, phospholipids are at the front lines and control what goes in and out of the cells, but please correct me if im wrong

the phenomenon that would be cited as evidence of increased economic interdependence between europe and the americas is  the development of mercantilism.

this theory suggests that the wealth of a country depends on its economic assets, or capital.

hope this : )

its c not d   tell me if that´s correct