Question

select the correct answer from each drop - down menu
why are biogeochemical cycles important?
earth is a closed system. that means the amount of rocks, metals, carbon, nitrogen, oxygen, and water on earth
so, it is essential that biogeochemical cycles these materials as they move through
earths subsystems
destroy
create
renew

Explanation:

Earth is a closed system, so the amount of essential materials like rocks, metals, carbon, nitrogen, oxygen, and water remains constant. Biogeochemical cycles are crucial as they renew these materials as they move through Earth's subsystems. Destroying or creating new materials (in the sense of new matter creation) isn't possible in a closed system; renewal through cycling is the key process.

Answer:

First blank (assuming it's about the amount being constant, but since only the second dropdown is shown with options): For the second dropdown - "renew" is the correct answer.