Along tail can be used to move through water by an animal, and thus swimming is defined as a special kind of moving, namely moving in or through water. Given these facts, a long tail can be used to do what among the following options:
- courtship
 - Electrical energy
 - gather meat
 - hide from predators
 - swim through water
 - it keeps an organism warm
 - reproduce
 - build shelter


 

     swim through water    