Question

In human beings, air enters into the body through .......... and moves into ........... In fishes, water enters into the body through .......... and the dissolved oxygen diffuses into ...........

Answer 1

Humans are land animals whereas fishes are aquatic animals and hence they have a different kind of respiratory system. The respiratory organ in human is lungs and in fishes, it is gills. In human beings, air enters into the body through the trachea and moves into the lungs. But in fishes, water enters into the body through its mouth and dissolved oxygen diffuses into the gills.

So the correct answer is 'Trachea, lungs, mouth, and gills respectively'.