ned by phosphorus mining? (1 pt) (a) Atmosphere (b) Lithosphere (c) Hydrosphere (d) Biosphere What reservoir is nitrogen acquired from for fertilizer?...

How does carbon enter the biosphere? (1 pt)(a) Marine snow and sediment accumulation(b) Photosynthesis (0) Cellular respiration (d) Fossil Fuel Combustion Which key nutrient requires bacteria to become bioavailable? (1 pt)(a) Carbon (b) Nitrogen (c) Phosphorus (d) Potassium What reservoir is threatened by phosphorus mining? (1 pt)(a) Atmosphere (b) Lithosphere (c) Hydrosphere (d) Biosphere What reservoir is nitrogen acquired from for fertilizer? (1 pt)(a) Atmosphere (b) Lithosphere (c) Hydrosphere (d) Biosphere Eutrophication can occur in ecosystems with no human influence. (1 pt)(a) true(b) false Does every continent have a dead zone? (1 pt) (8) yes(b) no