Question

select the running - freshwater ecosystem.
this ecosystem has:
daily flooding and draining of seawater
water that is rich in nutrients
many different types of organisms
this ecosystem has:
very deep water at the bottom of the ocean
no sunlight
organisms that crawl or stick to the ground
this ecosystem has:
water that is low in salt and rich in oxygen
flowing water
organisms that swim or stick to rocks

Explanation:

A running - freshwater ecosystem has flowing water (not daily flooding and draining of seawater like a coastal intertidal zone, nor very deep ocean bottom water). It has water that is low in salt (freshwater) and rich in oxygen (due to flow), and organisms that are adapted to flowing water (like those that swim or stick to rocks).

Answer:

The third ecosystem (with water that is low in salt and rich in oxygen, flowing water, and organisms that swim or stick to rocks) is the running - freshwater ecosystem.