| 31. | The spicules are composed solely of strongyles, cylindrical in shape with rounded ends.
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| 32. | More commonly, the mesohyl is stiffened by spicules, by spongin fibers or both.
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| 33. | For example, it is uncertain whether the ancestral mollusc was embryological origins of spicules.
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| 34. | The tissues of this tunicate are strengthened by the presence of two types of spicules.
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| 35. | The body of the sponge consists of a spicule and fibers and is water absorbent.
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| 36. | Trabeculae are the tiny spicules of bone crisscrossing the cancellous bone that make it look spongy.
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| 37. | Its color is white with variable amounts of bright yellow dots on top of the spicules.
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| 38. | Sponge skeletons consist of either spongin or calcareous and siliceous spicules with some collagen molecules interspersed.
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| 39. | It is the combination of spicule forms within a sponge s tissues that helps identify the species.
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| 40. | The silica spicules fossilised with the sponges makes the material hazardous to handle by being highly abrasive.
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