At a hydrothermal vent,

a: sea water seeps out the ocean floor through cracks in the crust

b: bacteria and other organisms die due to lack of nutrients

c: see water seeps into the ocean floor at the cracks in the crust

The answer is A

Explanation:

A hydrothermal vent can be fond along underwater rifts or along plate tectonics and along their boundaries

sorghum farming likely spread with the bantu migration. there is your answer i had to get it wrong to get this right so i hope ya'll enjoy!