In the late 7th century, the Native American population dropped drastically due to a <span>contagious disease.
</span><span> contagious </span>diseases can transmit from person to another easily.
Technology helped navigation for people because back a long time ago sailors had to see the wind and have to actually look and watch for what they were.Now that technology is made you can go to google maps and thats all it takes.
I think the anser is C that what i think
