Question

where is carbon stored as carbon dioxide that allows fluid, constant movement to and from the atmosphere? rock and sediment deep ground soil the oceans

Explanation:

Carbon dioxide in the atmosphere dissolves in the oceans, and through processes like photosynthesis by marine organisms and chemical reactions, carbon is exchanged between the atmosphere and the oceans in a relatively fluid and constant manner. Rock and sediment and deep - ground soil have much slower carbon exchange rates with the atmosphere compared to the oceans.

Answer:

the oceans