What regulates water balance in organisms without kidneys?

The picture shows a fishing technique called trawling. how might trawling affect marine biodiversity

Jason adds the antibiotic penicillin to a bacterial culture. the bacteria develop genetic modifications in their genome, which gives them resistance to the antibiotic penicillin. what caused this genetic modification?

At which point is crust neither created nor destroyed? island chain mid-ocean ridge divergent boundary transform boundary