This book was written according to the curriculum announced by the Ministry of Education for the Biology course of the 2nd grade of Gymnasium.

It includes the chapters "Organisms in their environment" and "Diseases and factors related to their appearance" and is organized into seven (7) teaching units, each of which contains:

The main points of the teaching unit
Theory comprehension questions with answers
Answers to the questions - problems - activities of the Student's Book
Evaluation Criterion

The study of each chapter is completed with:

Answers to the questions - problems - activities for Revision of the Student's Book
Answers to the small researches and assignments
Review Evaluation Criteria
Answers to the Worksheets of the Teacher's Book
Answers to the Activities of the Workbook

At the end of the book, there are the answers to the Evaluation Criteria as well as a Bank of Review Questions with their answers, in order to assist students during the written recap exams at the end of the school year.