Because they constantly drink saltwater and excrete salt via the gills.
Yes, but under current law in most states they cannot get married.
The question does not make sense. The correct grammar is "a fish" not "an fish."
Whale-small fishies-plankton- algea?
Starfish are aquatic invertebrates but are oftenly called "Echinodermata" or the class Asteroidea. Happyanswers56: Starfish are aquatic invertabrates. so it's right.