The words сосны (pines), ели (firs), and берёзы (birches) all answer the question "Who/What grew?" and relate to the same verb ( росли ).
Use a comma between homogeneous members when there is no conjunction. If there is a single "и" between the last two items, no comma is needed before that "и". Where to Find Full Answers russkii iazyk 8 klassa avtor e.a bystrova n v mangutova gdz
Since you requested a "piece" or example, here is a general breakdown of how to approach a typical 8th-grade task from this curriculum, such as analyzing or Sentences with Homogeneous Members : Example Analysis: Homogeneous Members of a Sentence The words сосны (pines)