Terrestrial Organisms

The organisms that reside on land are terrestrial organisms. These organisms breathe through (inhale or exhale) atmospheric oxygen. 

Advantages of terrestrial organisms over aquatic organisms

• Air constitutes 21% of oxygen as compared to oxygen in water.
• Water constitutes less or equal to 1% of oxygen resulting in less oxygen availability.
• The low concentration of oxygen in water also affects aquatic organism's breathing rate. 
• Aquatic organisms breathing rate is faster than that of terrestrial organisms. 
• The reason is large concentration of oxygen favors the terristorial animals.