In fish, blood flows in a direction opposite to the flow of water over the gills


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In fish, blood flows in a direction opposite to the flow of water over the gills in a process known as 

a.exhalation

b.concurrent exchange

c.diffusion

d.countercurrent exchange

e.crosscurrent exchange 

Nov 21st, 2017

d. countercurrent exchange

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Apr 25th, 2015

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