I can help you solve a specific problem if you provide the details!

Good for detailed explanations of laboratory works.

Most 9th-grade biology curricula (especially in Russia/CIS) focus on . Check which section your "DZ" (homework) falls into:

Darwin’s theory, natural selection, and the origin of life. Ecology: Food chains, ecosystems, and biosphere cycles. 2. How to Solve Common Assignments

Great if you don't understand the theory —they have short video lessons for every 9th-grade topic. 4. Tips for Lab Works If your homework is a "Laboratornaya rabota": Objective: Copy it exactly from the book.

If you need to compare plant and animal cells, remember that plants have cell walls , chloroplasts , and large vacuoles , while animal cells do not.