Which statement explains why fish spend a lot of energy removing oxygen from water?
А
They have to pump large volumes of water through their gills to keep their respiratory membranes moist.
The CO2 content of their tissues is much higher than that of terrestrial animals.
Their gills are covered with protective plates which make it more difficult for them to process the oxygen
from
air.
They have to pump large volumes of water through their gills because of water's low oxygen content.
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