Fish adapt to their environment by having a streamline body to cut through the water and they have gills to help them breathe under water. Some fish are even camouflage to disguise them underwater.
No.
Gills
it acts like a stone
kalangiskisan or firashies and with the connection of gills
yes they have
mud skipper and any shell fishes .
Its an adaptation created over time in order to help them maneuver through their environment. Evolution to be frank.
Deserts are inanimate, physical features, as such they can not manifest any form of adaptation, only living creatures can do this.
Adaptation to their changing environmental conditions.
Adaptation helps animals survive in their environment or niche. Behavioral adaptation can be inherited or learnt. Anatomical adaptation depends on physical features such as shape.
they can grow back broken off pieces of themselves.
its thick skin protets it from the sun