I'd say the answer to this queston is smog
Yes, people should try to save Asian elephants. They are hunted and killed for their tusks. These parts of their body are used for medicinal reasons. Many people “save” elephants by trimming off their tusks, making it so that killing the animal would be meaningless.
(Hope this is what you wanted, I learned this in a documentary forever ago.)
Short explanation: Elephants are in danger due to poachers, they hunt them for their tusks.
Don’t know how much you needed but here you go
Answer: Sea stars move using a water vascular system. Water comes into the system via the madreporite. It is then circulated from the stone canal to the ring canal and into the radial canals.
Explanation: The radial canals carry water to the ampullae and provide suction to the tube feet.
Dry mouth or a decrease in urine output possibly ?