6th Grade Study Guides - Take online courses on Study.com that are fun and engaging. Pass exams to earn real college credit. Research schools and degrees to further your education.. This site provides external links as a convenience to our users. The appearance of external hyperlinks on the Jefferson County Schools (JCS) website does not constitute endorsement by JCS of the linked websites, or the information, products or services contained therein.. Topic 1.1 Model Organisms. Plants are a diverse group of organisms with different adaptations to a wide variety of environments. Consequently, some plants have characteristics that make them easy to grow and study in the lab..