Mollusks are invertebrates such as the common snail.
Slugs slugs, a common garden pest, are snails without a shell.
Mollusks are invertebrates such as common garden pests with shells.
What are invertebrates such as common garden pests with shells?

[a] graptolites
[b] homogenous
[c] mollusks
[d] animals
[e] micorbes
[f] insects
[g] gardeners
[h] spores