Gas exchanges in different mediums

Aquatic Gas Exchange is about water. If there is water in the medium.
Advantage of aquatic gas exchange:
Keeping surface moist is no problem
Disadvantage of aquatic gas exchange:
O2 concentrations in water are low, especially in warmer and saltier environments


Terrestrial Gas Exchange mean , gas exchange is occuring on dry lands.
Advantages:
O2 diffuses faster in air
Air contains much more O2 than water
Disadvantage:
Surfaces must be internal to avoid loss of water due to evaporation