Yes, some filters allow this. Some pressure must be aplied, to counteract the osmotic pressure. For more information, do some reading on reverse osmosis.
Could be an oceanographer.
Oil and seawater can be separated using methods like skimming or using specialized equipment like oil-water separators. Skimming involves physically removing the oil from the surface of the seawater, while oil-water separators use a combination of gravity and filtration to separate the two substances. These methods help to minimize the environmental impact of oil spills in marine environments.
The salt in seawater dehydrates your body. (That's why meat could be preserved with salt.)
Because the salt in the seawater dries it up. Salt is very bad for any form of plant
filtration and then osmosis
It is not ideal to keep a jellyfish. The mechanical filtration could be any or none. The biological filtration is what does it all.
It depends on the what the sample is for, but at least get both girls and boys in the sample.
Separation by decantation and filtration.
There are quite a few good water filtration systems that could be bought for a reasonable price. To name a few, you could consider Pure Pro and Kent.
All i know is you could boil it and it will take all the germs away not sure about the rest
well a sample size can be any size depending on the requirements. A sample size could be 10 people of that entire population or it could be 1000 people.
Someone can get a sample of sandstone at cliffs and quarries around the world.