9) Which "text evidence" BEST supports the key idea? * 9 points
"The Mississippi River is part of the largest river system in North America."
"The Mississippi River is the chief river in the Mississippi system."
"The Mississippi river system, with all of its tributaries, is the fourth longest in the
world, surpassed only by the Nile, the Amazon, and the Yangtze."
"This outflow makes it the fifth largest by volume in the world."