This is because ants leave a chemical trail for other ants to follow.
They are following a trail laid out by another ant that will take them to food, water or their home. Ants leave this trail of pheromones or scent as they travel. After finding food they return to the nest (following their own scent trail) and communicate this fact to other ants who then follow the scent trail to the food. As more ants travel the trail the scent gets stronger (easier to follow) and the random bumps are smoothed out making the trail straighter.
capillaries
to select a single line at a time you have to press "shift+right move key(-->)"
No. Ants will move however they find best to find food, and this is not affected by the weather. Most of the time, scattered ants are scouts searching for food, and ants moving in a line are ants following a trail to or from food/supplies. Ants do infact move to the weather. If it is about to rain they will all be moving around thier nest in a hurry try to fix up and holes where water can get in. They do move out and around further when it isn't going to rain but they do stick closer when it is going to rain.
The blood cells must move through the capillaries in a single file line because the diameter of the capillary is only slightly larger than the diameter of the blood cells - there isn't room for two blood cells to go through side by side.
Capillaries
yes
No they will move.
yes
really fast
Because he is a gay and wants to be with another colony of ants
Ants move small insects called aphids from plant to plant. The aphids are protected by the ants while the ants feed on sugary honeydew produced by the aphids. This is referred to as a symbiotic relationship.
move