13. a nutrient whose supply is negatively impacting an ecosystem's productivity 22. result of stormwater runoff which carries large amounts of nutrients into aquatic ecosystems

22. Storm runoff and irrigation runoff carrying elevated nutrients from fertilizer application can have indirect effects on aquatic ecosystems. ... Fertilizer and nutrient concentrations, not directly toxic to biota, can cause eutrophication in lakes, impoundments, bays, and estuaries and indirectly affect ecosystem structure.

the farther away the object is from the central star (the sun) it's gravitainal pull on the object is weaker when it is farther

explanation:

c is the correct answer hope this !