I think its because one ant puts down a pheromone when he goes out to get a resource that they need and if it lead to food or what ever they know where to go and the ants are following the pheromone
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The trajectory of the motion is a straight line.
The motion along a straight line is known as rectilinear motion.
If an object moving along a straight line,path,track etc.It,s motion is said to be straight line motion
no, a straight horizontal line doesn't indicates uniform motion
An object is said to be in uniform motion if it moves in a straight line at constant speed.