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Because that is the first place they found it. It is not the only or the first place to actually have water, but Earth is where we found it first.
Well water is found on Mars, and some of Jupiters Moons
Also the first planet outside our solar system ,HD 209458b, is told to have water, they found this because of the vapour in it's atmosphere.
the impact on water scarcity is a good variety of the world loosing water. but no body really knows why the ocean is up.
in the water
In water
Yes, hydrogen is found in every organism that has water in it. You for example.
Dr. Jessica Sunshine found water on the moon back in 2009.
The Romans.
Because the bacteria can be harmful to health and boiling will kill them.
They import it from aliens? I don't really know, ask your teacher! from rivers and wells
primal soup.