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Gas exchange is more difficult for aquatic animals with gills than for terrestrial animals with lungs because _____. gills have less surface area than lungs water contains much less oxygen per unit volume
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Gas exchange is more difficult for aquatic animals with gills than for terrestrial animals with lungs because _____. gills have less surface area than lungs water contains much less oxygen per unit volume than air water is less dense than air gills collapse in air gills allow only unidirectional transport

User Roger Nelson
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Answer:

Land animals breathe air.

Step-by-step explanation:

User Zenil
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