yes they can because they are water fleas
Not reliably.
Yes, you can do this treatment on your yard and it will kill fleas. The soap will coat the fleas and therefore kill them.
Water is easily frightened.. Just make sudden movements and you will see it shake... no kidding.... So, fleas are attracted to fear.. Thats why dogs have them. right? So, it stands to reason that if you pour chlorine on a dog with fleas, the fleas will die. Works the same with water... Fun fact... If you water fleas they grow up to be fireflies... true story.
Kill them
Many people believe that feeding their animals a garlic supplement will kill fleas.
No! There is nothing in Dawn dish soap that will chemically kill fleas or their eggs! It will smother them like any other soap & water combo! Quit looking for the cheap way out & buy the right product for your animals.
Yes
yes
No, sea water will quickly dehydrate you and eventually kill you.
No, just bight them. Unless the fleas have a disease, but I'm not sure!
The salt which is present in sea water will kill most crops.