Semipermeable means only certain substances can pass through. I imagine you are talking about cell membranes which are semipermeable. This means vital things like oxygen and nutrients are able to pass through the membrane, while not allowing everything to enter the cell
in my opinion it could translate to lack of creativity within today's society
I think it is erosion (2) because erosion removes soil, rock, and dissolved material.
A. Migration (birds migraye to warmer climates during colder months)
Lots of resources are located in the United States. Such as oil, gold, silver, iron, and much more.
