Julie finds a snail on the sidewalk and wants to know whether or not the snail moves throughout the day. she places a single mark on the sidewalk next to the snail. what will julie use the mark for initially?

To check the movement of the snail.

Explanation:

She will mark a base line to know if the snail started movement, at the end of the day she can measure from her first line to her last to see how far the snail went.

seeing the graph would

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide