Question

where is the greatest amount of the worlds carbon found? atmosphere seafloor sediments ocean plants and animals

Explanation:

The ocean contains a vast amount of carbon in the form of dissolved carbon - dioxide and in marine organisms. Seafloor sediments also store carbon but not as much as the ocean. The atmosphere has a significant amount of carbon - dioxide but is less than the ocean. Plants and animals store carbon but their total amount is much less compared to the ocean.

Answer:

ocean