Choose the true statements about the evolution of larval dispersal in marine snails.
_____ The evolution of non-dispersing snails is likely to hinder speciation.
_____ Clades of non-dispersing snails are less species rich than those of dispersing snails.
_____ Loss of structures in the transition from dispersing to non-dispersing may inhibit evolutionary reversal.
_____ Possession of dispersing larvae is the ancestral state in snails.
_____ Cladistics shows that there are more instances of the transition from dispersing to non-dispersing larvae than the reverse.
_____ The evolution of non-dispersing snails is likely to hinder speciation.
_____ Clades of non-dispersing snails are less species rich than those of dispersing snails.
__X__ Loss of structures in the transition from dispersing to non-dispersing may inhibit evolutionary reversal.
__X__ Possession of dispersing larvae is the ancestral state in snails.
__X__ Cladistics shows that there are more instances of the transition from dispersing to non-dispersing larvae than the reverse.
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