What has a positive impact on an ecosystem?
mussels hurricanes invasive species Frogs stay warm animals wildfires oxygen
A B C D E F G H
Trees produce oxygen.
Oxygen has a positive impact on an ecosystem.
What has a positive impact on an ecosystem? (A) mussels (B) hurricanes (C) invasive species (D) Frogs (E) stay warm (F) animals (G) wildfires (H) oxygen