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Skeletal support in sponges may be provided by a. spicules of calcium carbonate. c. spongin fibers. b. spicules of silica. d. All of the above

Skeletal support in sponges may be provided by a. spicules of calcium carbonate. c. spongin fibers. b. spicules of silica. d. All of the above
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Skeletal support in sponges may be provided by a. spicules of calcium carbonate. c. spongin fibers. b. spicules of silica. d. All of the above

User David Schwartz
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it would be all of above, since they all contained in the skeletal
User Tony Chemit
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