Assertion: diatom's shape | /r/CapableOf | evolve to provide robust first line of defense
Facets:
value: against various type of grazers
type: TRANSITIVE-OBJECT
Source sentences:
text: Smetacek (81, 82) has argued that the many different shapes and sizes of diatoms evolved to provide a robust first line of defense against various type of grazers, therefore being the functional equivalents of the waxy cuticles, trichomes, and spines of higher plants.