Final answer:
The mean percentage of oxygen in blood that has gone through only the gills of light-blue soldier crabs can be estimated by considering the process of diffusion. Gills are thin tissue filaments that are highly branched and folded, providing a large surface area for oxygen uptake.
Step-by-step explanation:
The mean percentage of oxygen in the blood that has gone through only the gills of light-blue soldier crabs can be estimated by considering the process of diffusion. Gills are thin tissue filaments that are highly branched and folded, providing a large surface area for oxygen uptake.
In addition to this, oxygen molecules in water, which have a higher concentration than the gills, diffuse into the blood through the gill surfaces. While the exact percentage of oxygen will vary depending on factors such as water oxygen concentration and crab metabolism, it can be expected to be higher than the concentration of oxygen in the gills before diffusion.