Yes, pterodactyl, or pterodactylus was a real animal.
because it is hard to solve the fossil and the organism it is
There is no scientific evidence that dragons, as depicted in mythology and folklore, ever existed. Many cultures have stories of dragon-like creatures, which likely stem from a combination of ancient misinterpretations of large fossils, cultural symbolism, and the human tendency to create mythical beings. Fossils of large reptiles, like dinosaurs, may have inspired these legends. However, no credible fossil or archaeological evidence supports the existence of dragons as they are traditionally portrayed.
None, there is no scientific evidence that they ever existed!
There is no evidence that unicorns have ever existed.
There is no evidence that dragons ever existed in reality, so no.
Atlantis is a mythological island that was written about by Plato. There is no evidence that Atlantis ever existed.
There is no evidence so far that life exists on Mars - or that it ever existed there. Of course, it may have existed - more research is required to be sure.
No. Fossil evidence does not indicate kiwi could ever fly.
Currently there is no evidence that life exists or ever existed on mars, so it is unknown
There is no evidence that such a city ever existed, at least not by that name. It is considered a myth.
The is no evidence at all that the Philadelphia Project ever existed and in fact there is a lot of evidence indicating that it was not real. Basically, the story is a hoax.