Which activity would best keep the world's oxygen supply from decreasing? a. planting trees in forests that have been harmed b. changing jungles into farmland c. cutting down forests to sell wood d. clearing trees from areas near rivers

Secondary pollutants are more harmful than primary pollutants. select the best answer from the choices provided ot of

Which events are likely to be catastrophic to an ecosystem? select the three correct answers.a-hurricane.b-steady population growth.c-seasonal flooding.d-introducing of an aggressive invasive species.e-tsunami.

Consider an organism that is eukaryotic, found in both unicellular and multicellular forms, may resemble a plant but is not photosynthetic, has chitin in its cell walls, and absorbs organic nutrients from decomposing material in the environment. this organism would be classified as which of the following types of organisms? a. fungib. protozoac. bacteriad. archaea