Due to countercurrent flow in fish gills, __________

with the __________ oxygen concentration is always
in contact with __________ containing __________
oxygen.
a. blood; most; water; less
b. water; least; blood; less
c. water; greatest; blood; greater
d. blood; greatest; blood; less
e. water; greatest; water; less


Answer: b

Biology & Microbiology

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