plz help i have a bioligy test tommorow =(
how does the structure of fish gills allow efficient gaseous exchange in water?
November 9th, 2008 · 1 Comment
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1 Wupadoo // Nov 9, 2008
http://en.wikipedia.org/wiki/Fish#Respiratory_system
This site is graphic.
http://www.earthlife.net/fish/gills.html