Question

3. Gills are like slits made of very fine thread-like structures called
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Answer 1

Answer:

Hello mate

Filaments

Explanation:

Gills are tissues that are like short threads, protein structures called filaments. These filaments have many functions including the transfer of ions and water, as well as the exchange of oxygen, carbon dioxide, acids and ammonia.

Answer 2

Answer:

Fish gills are organs that allow fish to breathe underwater. Most fish exchange gases like oxygen and carbon dioxide using gills that are protected under gill covers (operculum) on both sides of the pharynx (throat). Gills are tissues that are like short threads, protein structures called filaments. These filaments have many functions including the transfer of ions and water, as well as the exchange of oxygen, carbon dioxide, acids and ammonia.[1][2] Each filament contains a capillary network that provides a large surface area for exchanging oxygen and carbon dioxide.