What symbol did the maya use for zero? what symbols did they use for one and for five?

Who ever answer first get ! question 1: which term names the outer edge all around a watershed? a. divide b. basin c. boundary d. collection area question 2: which feature does contour line indicate on a topographic map? a. the path of a river through the watershed b. equal elevation c. similar runoff level d. the boundary of an aquifer