3 a Why is it useful for crabs that live on the sea shore to have both lungs
and gills.
b If equal volumes of blood go through the lungs and gills of light-blue
soldier crabs, suggest the mean percentage of oxygen that would be found in
the blood having gone through only the gills. Explain your reasoning.
c What does this tell you about how efficient both lungs and gills are in these
crabs?
d Suggest three reasons for this difference.
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Ответ:
Although impossible for humans, or any mammal for that matter, breathing in both aquatic and terrestrial environments is simply routine for these incredible crustaceans. Like fishes, crabs use their gills to absorb oxygen from water.
Ответ: