What is the largest ecosystem on the planet?

Approximately how much of the planet is covered in water?

What is the intertidal zone?

What is an estuary?

Protists are the primary producers in an ocean. This would be an example of what factor?

Where does most of the primary production occur in an ocean ecosystem?

What percentage of water of Earth is considered freshwater?

Where is most of the freshwater located on Earth?

What percentage of fish species live in freshwater ecosystems?

___________________ are freshwater ecosystems with high biodiversity that are also declining in numbers.

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