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Gill lamellae increase.........

Water is taken in through the?

the flow are water and blood are?

This is known as?

Why is a countercurrent flow important?

What would be a result of both the water and blood flowing in the same direction?

What is one example of something that happens because of the countercurrent flow?

What is another example?

What percentage of oxygen is absorbed into the blood?

What is the flow called they are in the same direction?