It's DMZ demilitarized zone.
-The Epipelagic zone (sunlight zone) -The Mesopelagic zone (twilight zone) -The Bathypelagic zone (midnight zone)
External, meaning outside. Thus, Outside(External) Skeleton.
more external, most external
the reproduction of frogs are external fertilization. By Crystal
midnight zone?
external fertilization is external
Is a salmon internal or external?
A crab has an external hard shell, and is an invertebrate.
internal external not internal external not
The twilight zone is the one under the sunlit zone
its the sublittoral zone