Is all of Earth’s carbon dioxide supply constantly being used by organisms?

Question

Responses

No, some is stored in Earth’s only carbon sink, the atmosphere.
No, some is stored in Earth’s only carbon sink, the atmosphere.

Yes, and it briefly passes through the atmosphere as it cycles between organisms.
Yes, and it briefly passes through the atmosphere as it cycles between organisms.

No, some is stored in Earth’s carbon sinks, such as the oceans.
No, some is stored in Earth’s carbon sinks, such as the oceans.

Yes, and it is used up as soon as it is formed.

Answer 1

The most accurate response is:

No, some is stored in Earth’s carbon sinks, such as the oceans.

This reflects that while organisms do utilize carbon dioxide in processes like photosynthesis and respiration, not all of the carbon dioxide on Earth is being used; a significant portion is stored in various carbon sinks, including the atmosphere, oceans, and terrestrial ecosystems.