A Why is it useful for crabs that live on the seashore 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 has 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.