seaweed
where would you see a gudgeon flying, swimming or burrowing
Acidic
well i would be swimming if a small lake
There would be no measurable difference.
In Mexico, amoebas get in the water. people get food poisoning and call it moctezuma's revenge. Amoebas are protists. Protists are in the Kingdom Protista.
Unless you have an ozonator, which would inject ozone (O3) to sanitize, there are no gases added to the water of a swimming pool.
no because if they get wet the water will freeze, swimming would be very dangerous and suicidal.
animal-like protists
yes they do or they would dye without swimming in salt water
If you are swimming in clean, chlorinated water this would be safe. If the water is not very clean, then there is a risk of exposing your sore to an infection. Personally, I would wait for the sore to heal.
glaciers
glaciers