Assertion: diatom's shape | /r/HasProperty | few centric diatoms
Facets:
Source sentences:
text: Diatoms have two distinct shapes: a few (centric diatoms) are radially symmetric, while most (pennate diatoms) are broadly bilaterally symmetric.
text: Diatoms have two shapes: a few (centric diatoms) are radially symmetric, while most (pennate diatoms) approach being bilaterally symmetric: this shape is the reason for the group name diatoms.