Using the motor skills classification system that emphasizes the stability or instability of the environment, a basketball free throw would be a skill.

Discrete motor skills

Explanation:

When throwing a basketball free throw will consist of a set skills that have an observable begininng and finish

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.

yes, since there is a positive and a negetive if the positive and negitive wasn't there wouldn't a flow electricity in it.