Answer:
to bring goods to the u.s.
I think the correct answer is
(A) changing in abiotic factors
Earth can be considered as a closed system, since it only receives sunlight (energy), while the overall mass stays constant, without (almost) any exchange from space. Another example of a closed system is a saucepan or frying pan, on a stove, when its lid is closed.
You need to show us the graph
Hello the answer for your question is immigration.
