Which of the following statements is true of harappan civilization?
a. the harappan civilization fell to aryan invaders
b. harappan writings have told historians much about their culture
c. there were only weak ties between the cities
d. its influence was greater than that of ancient egypt

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.

freedom of speech is also protected by the 1 amendment.

explanation:

here is pretty much what the 1st amendment says:

congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the government for a redress of grievances.

. most was thought to be found in the nubian desert, which is part of the sahara desert.