Question

What advantages over an aquatic organism does a terrestrial oganism have with regard to obtaining oxygen for respiration?

Answer 1

Terrestrial organism does not need to look for oxygen as their is abundant amount of oxygen in terrestrial atmosphere through which they can intake more amount of oxygen in one breathe while the oxygen in aquatic atmosphere was dissolved in water hence the aquatic organism intake less amount of oxygen in one breathe.

Answer 2

Terrestrial organisms take up oxygen from the atmosphere whereas aquatic animals obtain oxygen from water. Air contains more O2 as compared to water. Since the content of O2 in air is high, the terrestrial animals do not have to breathe faster to get more oxygen. Therefore, unlike aquatic animals, terrestrial animals do not need adaptations for gaseous exchange.