Question

..............?????..........

Answer 1

(i) Epiglottis

(ii) because aquatic animals have gills and they support the purpose

Answer 2

(i) The usual upright position of the epiglottis (a flap covering the larynx - voice box) allows air to flow into the lungs and the larynx. When you swallow, the epiglottis flattens backward to cover the entrance to your larynx and prevent food from entering the lungs and trachea. The epiglottis returns to its usual position after swallowing.

(ii) Aquatic animals use the oxygen dissolved in water for breathing. The amount of oxygen dissolved in water is much lower than that present in air. Hence, aquatic animals need to take in adequate amount of oxygen for their body in a much lesser time. So, the rate of breathing in aquatic animals is much faster than that of terrestrial animals.