What are some features of the deep sea vent ecosystem

(please help :) )

Maybe this information is helpful:

The features of the ocean floor are not permanent, and are gradually changing over time due to the movement of tectonic plates. Most of the ocean floor features from close to where the plates are shifting either towards or away from each other. Marine ecosystems are found around parts of the ocean floor features, even the Mariana Trench, which is the deepest trench in the world.

the answer to this question is 3.