Native americans knowlege helped europeans settlers in many ways. which of the following best illustrates this idea a. some native americans convertid to christianity
b. some native americans allowed europeans to join their society
c. some native americans traded their goods with europeans traders
d. some native americans showed europes how to grow american crops

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

fù o n*gga

the border between arizona and new mexico is a thin, black line; this indicates a state boundary.

its correct: it's a thin line, and it's a state boundary, correct