Because it's what you could commonly recognise as a slug, a snail without a shell is still a snail just without its shell, the same as if you remove a zebra's stripes it's still a zebra not a horse.
No. Slugs are mollusks.
The term 'slug' is considered a common name for ALL slug species. Thus, it is impossible to deduce from your question which species of slug you would like to be classified.
rifle slug regular slug
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the covering of a slug is slimy
No, a slug is an animal.
What is the function of slug slime
I assume you mean "A" sea slug. No, a sea slug is not a fish, but an echidnoderm.
Slug=Limax
Then you got shat on by a slug.
A cardinal is a carnivore and a slug is not
a slug is a consumer