Some questions attract vandalism, when people change good answers to nonsense. Therefore, those answers are 'locked'.
Some answers are tampered with so they are locked to prevent this from happening.
Yes , you can answer the questions on wikianswers.
There are over 600 questions about Michelangelo on WikiAnswers.
There are over 224,500 questions about celebrities on WikiAnswers.
There are over 1,000 athlete questions on WikiAnswers.
There are over 6,500 questions about authors on WikiAnswers.
There are over 6,500 questions about poets on WikiAnswers.
WikiAnswers visitors ask questions. You wrote this one! :-)
There are over 20,000 questions about entertainment and arts questions on WikiAnswers.
Wikianswers does not answer your questions. It is people from around the globe on the internet that answer the questions.
WikiAnswers is important because it is a question and answer website and it answers questions for everyone everywhere. A lot of question and answer websites don't allow you to edit answers but WikiAnswers allows you to edit any answer as many times you want. Once the answer is perfect and percise, the answer may be locked by a supervisor.
You cannot demand answers from WikiAnswers on your questions. WikiAnswers does not answer your questions, it is the members of this community that answer your questions. You can request for your question to be answered but not demand for the same.