The Student Book consists of 9 units presenting specific topic or concept12 lessons in each unit 5E learning circle cultivates critical thinking skills. Each unit begins with a Big Question which students work towards answering throughout the unit, learning to apply scientific practices. Lesson Checks and Got it? self-assessments enable students to self-evaluate and take responsibility for their level of learning. Glossary at the end of each level features all key vocabulary and definitions in one place.