Both
internal external not internal external not
its internal
Is a salmon internal or external?
All mollusks are invertebrates because they have no internal skeleton with a backbone. Sea slugs don't even have an external shell like most mollusks do!
What is internal and external sources?
internal
external
External. Internal devices would be something like a CD Drive, while an external device is a keyboard or mouse for example.
internal is in and external is out
internal is in and external is out fertilisation
Internal and external? 4real
Every mollusk except slugs, which have evolved to not need a shell, has a shell. Snails, clams and other bivalves have an external shell. Octopi, squid and cuttlefish have an internal shell.