The largest living carbon sink among the options provided is forests. Forests are capable of storing significant amounts of carbon dioxide (CO2) through photosynthesis. Trees absorb CO2 from the atmosphere and release oxygen while storing the carbon in their biomass. Forests play a crucial role in mitigating climate change by sequestering and storing carbon over long periods. However, it's important to note that oceans and soil also act as carbon sinks, although forests are generally considered to be the largest terrestrial carbon sink. Insects, on the other hand, do not function as significant carbon sinks.
