Meerkats live in family groups. Each family occupies a territory that they guard against strange meerkats invading from outside.
Yes Meerkats will fight over territory and burrows which they live in
no
with a fence
They do mark their territory on cacti. Although, I'm not quite sure how valid this question is.
They will bark at them to try and defend there territory, they are saying to them "this is my territory"
it shoots ink at its rival to intimidate it.
it pees on one another
yes
They don't ! Defending territory is left to the males. The more a male defends his territory - the more likely he will be to sire kittens.
To defend their territory. and impose a point of power.
It can be used to defend our enemies entering our territory.