What should you say or do, if someone gives a wrong answer or an answer that you disagree with?
Yell out, "What a dumb answer! Were you even listening?" Then tell your answer to the class.
Remember that being respectful is the most important rule in STEM Lab, and don't say anything. It would not be nice to say something because it might embarrass the other student.
Remember that one of the policies of STEM Lab is to challenge other students in class discussions and immediately tell the class your answer or opinion and explain why your answer or opinion is right and their answer or opinion is wrong.
Remember that your ideas and opinions in STEM Lab are all valued. Wait until the student is finished. Raise your hand and when called on, explain that you disagree, give your answer, and back up your answer with evidence.