Q:

The rate of respiration is much faster in aquatic animals/organisms than in terrestrial animals. To whom can the credit be given for this?

• 1
  more amount of dissolved oxygen in water than the amount of oxygen in the air
• 2
  more amount of oxygen in the air than the amount of oxygen dissolved in water
• 3
  presence of gills in aquatic animals
• 4
  less amount of dissolved oxygen in water as compared to the amount of oxygen in the air