Water makes up what fraction of the human body?

The place where an organism lives and that provides the things it needs to survive is its

What percent of the water on Earth is salt water?

What percent of the water on Earth is freshwater?

Where is most of the freshwater on Earth located?

Which ocean is the largest?

Which below is not a way that dissolved oxygen can get into a water system.

The oxygen found in the water molecule (H20) is the oxygen that fish can use to breathe.

What can happen if the dissolved oxygen level drop below normal levels?

Which contains the most dissolved oxygen?

What is the measure of the acidic or basic level of a water system?

What is neutral pH?

What is the most likely source of phosphates and nitrates?

What can an excess amount of phosphates and nitrates do to an aquatic ecosystem?

Which factor below will not affect the temperature of an aquatic ecosystem.

What is the measure of the amount of suspended material found in a water system?

What instrument is used to measure turbidity?

What is one way to decrease the turbidity in a stream?

A species which is used to indicate the health of an environment or ecosystem.

Over the last million years, what has happened to the total amount of water on earth?

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