Answers
1. True
2. True
3. True
4. True
5. True
Chloride and sodium, I believe. Chloride and Sodium are believed to be salty, and this concentration makes up 90% of all dissolved ions in the ocean.
The National Institutes of Health found it effective in reducing pain and other symptoms, but it is not clear how it works.
It would destroy the population of some of the nests