Not neccessarily. Some Bettas do have very dark gills.
Do you mean frogs? If you do Frogs don't have gills there a cold blooded reptile and frogs are purely air breathers so they don't need gills.
Gills are an organ that fish have, that enables them to obtain oxygen from the water that they are in; it is what fish use instead of lungs.
gills is the answer
gills are like "lungs" to a fish.
The idiom "stuffed to the gills" means that something is completely full or packed to its maximum capacity. It is often used to describe a situation where there is no more space left.
no, because then those gills gills would need gills and they would need gills and so on, so on. They have specialised cells instead.
This means to feel nauseous or seasick.
it means they are having trouble breathing
Total? do you mean turtle? If so turtle have lungs.
gills.
Lobsters have gills.