Of course! I'll be happy to help you with Science 8 Lesson 18 Unit 6 quick check. However, as an AI text-based bot, I don't have direct access to specific lessons or content from a particular curriculum. Therefore, I'll need you to provide me with the specific question or problem you're having trouble with. Once you do, I'll do my best to explain the concept to you and guide you through the process of finding the answer.
