A responsive pleading is one that responds to what another party has filed. An answer responds to a complaint. An opposition to a motion to dismiss responds to a motion to dismiss. An affidavit and reply must be filed to a motion to dismiss a case.
No, a motion to dismiss is not a responsive pleading. Under the federal rules, the determination of "what's a pleading" is covered by Fed. Rule of Civil Procedure 7(a). If it isn't listed in Fed. R....
It is exactly that, what you plead initially.
Usually, people initially plead not guity to any offense. This is because pleading guilty admits guilt and will most definitely result in a conviction...
No, they are not the same. A 'pleading" is an 'argument' made to a judge or magistrate. An 'order' is a directive issued by the court that something should be done or take place.