The ecological significance of bryophytes are, in the tropical rainforest. Here they can absorb great quantities of rain and release water slowly into the atmosphere or ground. They also, along with the moisture, release quantities of ions i.e., Ca+. These balls support number of invertebrates and smaller organisms. Bascially these layers have created a second 'ground' or terra high in the tropical canopy. In wetlands such as bog lands and swamps, bryophytes absorb great quantities of water and release organic acids, which decrease decomposition rates. Hence the correct option is C.