As I live inland, not so much. However, several years ago I spent several weeks in Puget sound area and I was able to monitor birdlife and sea surface there. Interesting that trees and other plants are quite similar as those where I’m living. So you cannot necessarily say w/o more detailed study are the plants and trees growing near ocean or near inland lake. More close study confirmed that the soil was more conductive, thus salty. This is of course clearly visible when the plant is under a microscope. Speaking of sealife there are few fish which are adapted to ocean and brackish water. Some of them (or som percentage of them more likely) can survive even in freshwater.

Excellent!

Yes, definitely. It is not a personal belief but rather a fact that no matter how much we think we know or understand, we would eventually hit a wall or fathom the physics more, marking all previous discoveries as absurd or technically false in a way. The truth is nothing is just “false”- just like the cosmological constant – they are rather essential steps to what we now know.