The water of a river can be soft or hard acidic or alkaline.
In Indonesia, the leaves of Rhizophora are sometimes cooked with fish to acidify the meat.
No, it doesn't prove evolution.
Despite the eagerness to achieve the status of a developed nation by 2020, Malaysia realised that some ethnics will not part from their birth place — the forest and the sea.
Another syndrome — amnesic shellfish poisoning, is caused by toxin produced by blooms of diatoms b.
Like trees on land, these sea forests are what keep the planet healthy.