It depends on what mythical creature you are talking about. Dragons could have existed, but they would not have been able to fly (it is aerodynamically impossible), and they would not have been able to breathe fire. Animals similar to dragons but without those two characteristics did exist in the past.
Animals similar to the Loch Ness Monster definitely existed (have a look at Liopleurodon and Plesiosaurus). We are pretty sure that none of these creatures are alive today.
some people believe there were, but there is no scientific evidence that proves the existence of these creatures.
Werewolves are mythical creatures and no scientific evidence has ever been found that one exists.
There is no scientific evidence to support the existence of werewolves. Werewolves are typically viewed as creatures of folklore and mythology.
Mermaids are mythical creatures and do not exist in reality. They are often depicted in folklore and fairy tales, but there is no scientific evidence to support their existence.
Scientific conclusions are based on scientific evidence.
There is no scientific evidence to support the existence of real unicorns. Unicorns are mythical creatures that have been depicted in folklore and literature but have no basis in reality.
Graboids, the fictional underground creatures from the "Tremors" film series, are not real. They were created for entertainment and do not exist in nature. The concept of large, burrowing monsters has captured the imagination of audiences, but there is no scientific evidence to support the existence of such creatures.
Scientific evidence is facts or evidence that is used to prove or disprove a scientific theory. Scientific evidence appeal is when new finding or statistics are brought to light that disprove some or all of the previous evidence's findings.
As of now, there is no definitive scientific evidence to confirm the existence of intergalactic creatures. While the vastness of the universe suggests the possibility of extraterrestrial life, including intelligent beings, no confirmed sightings or contact have been made. Research continues in astrobiology and the search for extraterrestrial intelligence (SETI), but until concrete evidence is found, the existence of intergalactic creatures remains speculative.
Unicorns are mythical creatures with no scientific evidence of their existence. They are often portrayed in folklore, fairy tales, and fantasy literature, but have no basis in reality.
While there are stories of vampires and vampire like creatures in the mythologies of most cultures, there is no scientific or other evidence that vampires have ever existed. So, no.
No, mermaids are mythical creatures that do not exist in reality. They are often depicted in folklore and fairy tales, but there is no scientific evidence to support their existence.