Ernie; Why on earth do you know that?
Well due to my passionate interest in all things to do with animals/wildlife, I actually paid a bit of attention during biology lessons at school. I remember the biology teacher telling us that the mineral content of blood very much replicates the mineral content of seawater. I knew that seawater contains gold from my fish keeping hobby. That’s why I knew.
I also remember btw the biology teacher telling us that all our senses – hearing, taste, smell, and sight, rely totally on the direct presence of water/fluid.
All of which shows that when our ancestors dragged their sorry arses out of the sea and started crawling on the land, they in fact took the sea with them – each one of us is an individual sea 😀