Question

from where do Terrestrial animals and aquatic animal take in O2​

Answer 1

Answer:

terrestrial animal take atmospheric oxygen

aquatic animal take dissolved oxygen from water

Answer 2

Answer:

Terrestrial organism's take up ok oxygen from the atmosphere where as aquatic animal need to utilised oxygen present in the water . Air contain more O2 as compared to water.Since the content of O2 in air is high, the Terrestrial animal do not have to breathe faster to get more oxygen.