Chemosynthesis is a process in which an organism instead of utilizing the energy of sun utilizied another source of carbon such as methane for production of food.
Since, in deep sea the sunlight is not able to penetrate there, instead of photosynthesis, chemosynthesis takes place.
Marinesnow is the process in which the upper layer of detritus falls down from the upper layer of water column.
Marine snow is considered to be an important source of food for organisms living at the bottom of the ocean.
Thus, marine snow and chemosynthesis are the two processes that are an important source of food for deep sea organisms.
