yes
This pH is slightly basic.
probally fresh because no salt in mouth or eyes addition: it is easier to float/swim in seawater since seawater is denser than fresh water.
97% seawater, other 3% is freshwater.
No, it is seawater.
by evaporation
the seawater smells
A lower freezing point than fresh water
no.they must have fresh water to live.
Flash Distillation
You've already answered your own question. The difference is that feshwater lochs contain fresh water while seawater lochs contain seawater.
fresh milk usually has a pH of around 6.7, so it is slightly acidic.
Seawater because it contains salt which makes the water more dense than water which does not contain salt.