Online resources for high school biology students on ClassZone include interactive reviews, virtual dissections, teacher's toolkits, e-books, assessment quizzes, animations, simulations, virtual labs, activity makers, audio files and data analysis. As of September 2014, there are online resources for language arts, math, science, social studies and world languages. The resource is provided by McDougal Littell, a division of Houghton Mifflin Harcourt.
The interactive review section of ClassZone is a comprehensive area with animations, concept maps, vocabulary games, quizzes, flipcards and crossword puzzles. Quizzes start with five questions, and students get to move on when all five are answered correctly. Biology concepts cover 34 chapters on topics that range from cell structure to biological reproduction. Students and educators first choose a category and then an activity to engage various biological concepts.
Some ClassZone activities include preparation for state standardized testing. Students can also take practice tests related to the book's curriculum to master biological concepts. An online biology magazine updates various concepts with discoveries and new ideas as scientists make advances in the biological sciences.
McDougal Littell lists resources for each state and for international students delineated by middle school and high school books. Some textbooks go back to 2007 and 2010. Houghton Mifflin Harcourt's educators' page lists further resources for updated information.