what has a positive impact on an ecosystem?
animals Frogs. chemical spills Frogs pines parasites pollution mussels
A B C D E F G H
Forest is largely pine trees.
pines have a positive impact on an ecosystem
what has a positive impact on an ecosystem? (A) animals (B) Frogs. (C) chemical spills (D) Frogs (E) pines (F) parasites (G) pollution (H) mussels