Mollusks are invertebrates such as the common snail, and slugs Slugs, a common Garden pest, are snails without a shell. Given these facts, what are invertebrates such as common garden pests with shells among the following options:
- graptolites
 - homogenous
 - mollusks
 - animals
 - micorbes
 - insects
 - gardeners
 - spores


 

   mollusks      