Assertion: sponge's spicule | /r/MadeOf | silica
Facets:
Source sentences:
text: Their spicules, which are made of silica, form a scaffolding-like framework between whose rods the living tissue is suspended like a cobweb that contains most of the cell types.
text: Spicules, which are present in most but not all species, may be made of silica or calcium carbonate, and vary in shape from simple rods to three-dimensional "stars" with up to six rays.
text: In 2008 a University of Stuttgart team reported that spicules made of silica conduct light into the mesohyl, where the photosynthesizing endosymbionts live.
text: The skeleton of a sponge is formed from spicules which are made of silica (a glass-like material) or
text: The glass sponges have a skeleton that consists of fragile, glass-like spicules that are made of silica.
text: Hexactinellids, or "glassy" sponges are characterized by a rigid framework of spicules made of silica.
text: Spicules can be made of silica or calcium carbonate.