have that make them and ideal gas exchange organ? Select all that apply. a) They are highly folded (increasing surface area) b) They are never used in hypoxic environments (increasing concentration gradient) c) They are only possessed by small organisms (decreasing length) d) They are thin-walled (decreasing barrier thickness).
1. Gas exchange in terrestrial versus aquatic environments follows similar physical laws but there are also important differences. Using Fick's law, identify the MAIN factor that is different between these two environments?
a) Everything is different in water
b) Barrier thickness
c) Diffusion coefficient
d) Diffusion rate
2. Gills are used by most aquatic invertebrates for gas exchange. What are some of the characteristics they have that make them and ideal gas exchange organ? Select all that apply.
a) They are highly folded (increasing surface area)
b) They are never used in hypoxic environments (increasing concentration gradient)
c) They are only possessed by small organisms (decreasing length)
d) They are thin-walled (decreasing barrier thickness).
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