Respiration in aquatic animals occurs through

Respiration in aquatic animals occurs primarily through gills. Here are the steps:

1. Water, containing dissolved oxygen, enters the animal's mouth and flows over the gills.
2. The gills have many thin-walled blood vessels or capillaries.
3. As the water flows over the gill's capillaries, oxygen in the water diffuses through the thin walls of these capillaries and into the blood.
4. At the same time, carbon dioxide, a waste product from the animal's body, diffuses out of the capillaries into the water, which then leaves the animal's body.
5. The oxygen-rich blood is then transported to different parts of the animal's body to be used in cellular respiration, the process by which animals generate energy.

This process is efficient because water has a much higher density than air, so it contains a larger amount of oxygen. This allows aquatic animals to extract enough oxygen to survive in an aquatic environment.