Decomposers are necessary in an ecosystem because they * 1 point
A) produce food for plants by the process of photosynthesis
B) provide energy for plants by the process of decay
C) can rapidly reproduce and evolve
D) make inorganic materials available to plants

that's all i luck!

the species living around the vents are especially good at dispersal.  

deep-sea vent originates on the floor of the ocean when seawater circulates through hot volcanic rocks, usually situated where the new oceanic crust is being produced.  

biological dispersal refers to the movement of species from their location of birth to their site of breeding, or from breeding site to another. similarly, the oceanic dispersal refers to the movement of the species from one land mass to another by sea crossing.