Groin- inguinal region
Ear- auris
Head-cephalon
<span>element hydrogen joined to one atom of the element oxygen. there is a positive and negative side</span>
<span> gills, fins, and blood.
The three structures and physical entities that almost all fish have:
Gills
Fins
Blood
Almost all fish have gill slits because there is no other way they can breathe underwater without having gills.Fins are used to move around the water and blood delivers oxygen and nutrients.
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Expodentially is the correct answer
