Assertion: echinoderm's structure | /r/HasProperty | modified over time
Facets:
value: in ways
type: MANNER
value: in different groups of molluscs
type: LOCATION
value: by natural selection
type: OTHER
Source sentences:
text: However, in different groups of molluscs, the structure of the foot has been modified over time (by natural selection) in ways that reflect how the foot is used in locomotion by members of each clade.