Step-by-step explanation:
A model of the carbon cycle is a simple representation of what actually happens to the global carbon cycle.
For example: a model has four main reservoirs (atmosphere, biosphere, geosphere and oceans) and it includes a description of CO2 exchange processes between reservoirs, disregarding the interior transfer processes within the biosphere, geosphere and the oceans.
In addition, in these models, time does not seem to be a relevant factor, but all the processes seem to take place permanently in a short period of time. What actually happens is that most of the carbon on Earth is stored in rocks and is essentially inert over timescales of hundreds and thousands of years.
Answer:
So, we could say that a model of carbon cycle is different from the actual cycling of carbon in an ecosystem as it is simpler and faster.