Several platforms provide digital versions of these workbooks with filled-in answers and explanations:
Often associated with the "Line of Life" (Линия жизни) series. This is one of the most widely used workbooks in Russian schools. gdz po rt biologija 7 klass
Available in two parts, focusing on a systematic approach to biology. gdz po rt biologija 7 klass
If you are looking for specific answers, the 7th-grade curriculum generally focuses on: gdz po rt biologija 7 klass
From the "Living Nature" (Живая природа) series. What is covered in 7th Grade Biology?