The main matrix of the sponge is stiffened by spicules composed of:
A. Calcium carbonate
B. Magnesium phosphate
C. Calcium phosphate
D. Calcium carbonate or silicon dioxide
Answer:D
The main matrix of the sponge is stiffened by spicules composed of:
A. Calcium carbonate B. Magnesium phosphate C. Calcium phosphate D. Calcium carbonate or silicon dioxide