Match each label with the correct category to identify whether it represents a process involved in releasing carbon to the atmosphere, a process involved in taking up carbon into organisms (carbon uptake), or a carbon reservoir.

a) carbon reservoir (storage)
b) process of carbon uptake
c) process of carbon release

1) cellular respiration
2) combustion of fossil fuels
3) combustion of wood
4) microbial decomposition
5) photosynthesis
6) carbonic acid in oceans
7) living and nonliving biomass