Historical contribution points were introduced on Mon Feb 01, 2010, when the Split Contributions feature went live on WikiAnswers.
Your total WikiAnswers contribution points are calculated as the sum of all of the contribution points you have earned. These include first answers, edits, organizational actions, questions asked, and community contributions. All of these points come under the heading of "Contributions" in your WikiAnswers profile. Trust points are slightly different. Contributors do not directly earn these points through their contributions; they are awarded trust points by other WikiAnswers users. Therefore, trust points are not counted as contributions, and do not add to the contribution points total in a WikiAnswers profile.
Historical points are a record of some very old contributions that didn't fit into the new system (it was a bit like putting a video cassette into a DVD player). We didn't want you to lose them, so we created a special category for them. "Historical" contribution points can no longer be obtained, and the number won't change. You can view it as a little contribution nest egg. If you don't have Historical points on your profile, don't worry. It means all of your points fit right into the other point sections in your stats box.
Yes, you get one contribution point per answer.
You get one contribution point for answering a question, as it is only one action.
Message Boards and Question Discussions both count as community contribution points on WikiAnswers.
When re-categorizing a question 1 category equals 1 contribution point.
Any action you perform on WikiAnswers will generate a contribution of some kind. Whether the activity generates one or more points depends on the activity. Chatting, forum entries, and merging may not generate actual points, and the totals of your points could be adjusted by future guidelines. The point of wikianswers is not simply to generate points, although the points indicate your comparative interest and aid to the site.
There are various users with 0 contribution points, so this question is not possible to answer.
'Historical' points are points earned before a major site update changed the way contributions were counted. The site describes them as "miscellaneous points from our older system".
You get 2 contribution points for asking and categorizing a question.
While WikiAnswers does not encourage participating just for contribution points, a fast way to get them would be to correct the spelling, grammar and wording of questions/answers. You would be very surprised at how quickly they build up! If that is not your thing, answering questions in an area that you enjoy is not only fun, but does get contribution points!
You do not have to answer a certain amount of questions to upgrade your ranking on WikiAnswers. Any type of contribution will work to get you to the next rank. (Contribution types: messaging, editing, answering, or removing an answer, splitting and adding alternates, asking a question, and editing categories can get you contribution points. See the question "What are the various contributor levels on WikiAnswers" to see the next level you will become.