Are sea creatures dangerous to humans, like jellyfish, and killer whales, extraterrestrial in origin?

This is quite true as well. As improbable as it sounds, there are species of all kinds, land, sea, and air which are predatory in nature, destructive or dangerous, all of which are a scourge and degrade the quality of human life. These hazards are taken for granted and not seen as sinister personally, but those awarenesses are suppressed and this is part of the game, to lull people into complacency even as they are being ravaged.