This book is organized in such a way as to respond both to the demanding teaching work of teachers and to the efforts of students to successfully meet the multiple requirements of Biology in the positive direction.

In all chapters it contains:
- alphabetical and thematic classification of the terms of each chapter.
- understandable presentation and organization of the theory with diagrams.
- comparative tables of basic Biology terms.
- summary of basic knowledge at the end of each chapter.
- methodology for solving all exercises and model solutions.
- model answers to all theory questions.
- exercises for solving and questions.

For further understanding of the theory, the book contains:
- 41 diagrams,
- 45 tables,
- 75 images.