yes, yes they are.
a lionfish is like a lion, if you would say so. i guess you could call it the lion of the ocean, if you wish. a lionfish is a very poisonous fish with spines across it's back. if you were to touch these spines and be injected with their poison, you would be in a lot of pain, and may even die if you did not admit yourself to the hospital right away.
yes, they are members of the same family as scorpion fish and lion fish and deliver a quite a little sting.
Most fish (the ones with gills and fins) are vertebrates.
The same as English - "scorpion"
Fish
The Whip Scorpion or Vinergeron is not dangerous to humans. It is *not* a scorpion but does look like one. This is for self protection. The tail has no sting. The animal will emit a noxious, vinegar smelling fluid if disturbed. There is also a critter know as a Wind Scorpion which, again, is not a scorpion but a spider. It has the appearance of a scorpion ( same color, same general body shape) but again no sting and no claws. These will bite and have rather large fangs (4 of them) which can cause nasty infections but neither the Vinergeron or the Wind Scorpion are dangerously venomous.
A scorpion has the same temperature as the environment.
The most likely explanation for the introduction of lionfish into the Atlantic Ocean is through the aquarium trade. In August 1992, at least 6 lionfish were released into Biscayne Bay when a beach-side aquarium broke during Hurricane Andrew. It is also thought that lionfish were accidentally or deliberately released into the ocean by aquarium hobbyists.
They all should be fine as long as theyre all around the same size. Though, I'd be careful with the filefish. They graze for marine algae constantly and could mistake a well-camouflaged Sargassum Angler for a succulent peice of Sargassum, leading to some nipping. Same goes for the sea Goblin, as they usually bury themselves up to their eyes, leaving them exposed to nipping as well.
Not in the same sense as a land animal. But yes.
a whale you idiot
Yes, fish can become endangered the same way any other animal can.