6. The 26th Amendment was ratified on July 1, 1971. Do some research and explain what the 26th Amendment does.

It prohibits states from discriminating among voters based on age, for people who are at least 18 years old

Explanation:

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.