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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
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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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