Why/how do scientists classify the ocean into different zones? What might be at least 3 criteria they look at?

There are specialized producers that live in warm water vents deep in the ocean. these producers do not per-form from photosynthesis, but instead perform a similar process with iron and other chemicals. why do you think these producers use this process instead of photosynthesis?

Eutrophication caused by human nutrient pollution.

The basic types of tissue in the human body are