Plankton are the most numerous producers in this zone of the ocean. 

Coral Reefs are commonly found in this ocean zone. 

Organisms in this in this ecosystem must be able to survive major changes in salinity (salt levels). 

Some organisms in this Ocean zone use chemical from hydrothermal vents for energy instead of sunlight. 

Which of these is NOT an abiotic factor in aquatic ecosystems? 

How do rivers and streams differ from lakes and ponds? 

What is one way  organisms may be adapted to living in the moving water of a river? 

A partially enclosed body of water formed where a river flows into an ocean. 

an area of land that is saturated or soaked with water for at least part of the year. 

The two major types of aquatic ecosystems are