The Focus On Teacher’s Manual (3rd Edition) has teacher instructions for a single-subject area for any one of the 5 core disciplines (chemistry, biology, physics, geology, and astronomy). The Teacher’s Manual is meant to accompany the subject-specific Focus On Student Text and Focus On Lab Notebook. -There are 12 chapters that align to the experiments in the Lab Notebook (Focus on Biology has 16 chapters). -The front matter contains two materials lists: one by experiment and one by item type. -Sample answers are given where appropriate. Note that many questions do not have one fixed answer. -Sample results for experiments are shown where appropriate. The experiments have been tested, but your student may have a different outcome. -Subjects and grade levels are purchased separately. 3rd Edition materials are not compatible with 2nd Edition materials.