Class Schedule Semester 1Semester 2 A B A B Period 1: Plan/PLCPlan/PLCPlan/PLCPlan/PLC Period 2: Earth/SpaceAnatomy/PhysiologyEarth/SpaceEarth/Space Period 3: Earth/SpaceEarth/SpaceAnatomy/Physiology Earth/Space Period 4: Environmental Sci.Earth/SpaceEnvironmental Sci.Earth/Space