Answer:
d) Marine Snails
Step-by-step explanation:
Marine Snails has the smallest dispersal distance because of their slow mobility. These marine snails have very limited mobility when they are adults and spend their majority of lifetimes in a small geographical area. Dispersal distance refers to the distance a species can move from an existing place or population or the parent organism. According to this definition we can say that marine snails have the smallest dispersal distances.