Question

Write the names of two sea animals that have gills and two sea animals that have nostrils (or blowholes).

Answer 1

Sea animals with gills:

1. The breathing process is aided by the presence of a special organ in the fish known as the gills.
2. The fish takes water in and send it over the gills. Gills extract the dissolved oxygen from the water.
3. The carbon dioxide produced as a waste product is released out into the surrounding water through gills.
4. Examples: Rohu, sharks.

Sea-animals without gills:

1. The animals without gills acquire oxygen of adequate amount by coming on the water surface in order to breathe.
2. This is due to the absence of gills that are required for underwater breathing.
3. Examples: Whales and dolphins are mammals and they breathe air into their lungs.