julie finds a snail on the sidewalk and wants to know whether or not the snail moves throughout the day. she…

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.\nwhat will julie use the mark for initially?\n○ determining how fast the snail moves\n○ acting as a standard unit of measure\n○ determining the displacement of the snail\n○ acting as a reference point for detecting motion

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.\nwhat will julie use the mark for initially?\n○ determining how fast the snail moves\n○ acting as a standard unit of measure\n○ determining the displacement of the snail\n○ acting as a reference point for detecting motion

Answer

Answer:

D. acting as a reference point for detecting motion

Brief Explanations:

A reference point helps to observe if an object moves. Placing a mark next to the snail allows Julie to see if the snail changes position relative to it, which is detecting motion.