: You can search for the ISBN 5-93177-006-2 to see if a digital copy has been archived by the community. Quick Book Specifications Authors: A.I. Nikishov, V.N. Kuznetsov, D.L. Teplov. Pages: Approximately 224–272 pages.
Covers the biosphere, habitats, adaptations of organisms, and human interaction with nature. Экология. 5 (6) класс - Libex.ru
Because the book is out of print at major retailers like Books.ru , your best options are secondhand marketplaces:
: For modern alternatives if you cannot find the Nikishov edition, the Prosveshcheniye Mediateka offers digital forms of current ecology textbooks for grades 5 and 6.