A lot of your audience members may have questions to ask you during a presentation but they may not feel comfortable asking by speaking in front of the whole audience. For this, the Slides Q&A feature may be the thing you are looking for. It allows your audience members to put up questions from their electronic devices that they can vote on. You can view the questions and answer them during or at the end of the presentation. This is a great way for you to get questions from your audience that you may not normally get because those people may not like asking the question in front of a group of people. Learn more about the feature from Google in this link.