for poo.
Gills would be respiration
Fish have gills to breathe in the water. they swim in the water and are adapted :D :D :D
they have gills
By gills .
Lungs and Gills are both used for external respiration
The Gills
salmon
gills
The incurrent siphon of a clam is adapted to bring in water, along with food particles and oxygen, from the surrounding environment. This enables the clam to filter out and extract nutrients from the water using its gills for respiration and feeding.
it uses its gills
Between the lungs/gills and the environment
Like all fish- through their gills.