The sponges date back to
A) the Devonian period or "age of fishes."
B) the early time of anaerobic prokaryotes.
C) the Cambrian period and probably earlier.
D) the time of the first prokaryotes but the sponges left no fossil evidence for lack of hard parts.Ancestral members of the phylum Porifera arose at least by the early Cambrian period and probably into Precambrian times.Later evolution resulted in diversification into the classes present today.
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Q1: Which one of the following statements regarding
Q2: Specialized archaeocytes that secrete spongin are
A)collencytes.
B)sclerocytes.
C)choanocytes.
D)spongocytes.
E)lophocytes.Spongocytes are
Q4: The outer thin,flat,epithelial-like cells that cover the
Q5: Cells responsible for water flow and capture
Q6: Calcareous or siliceous elements of the sponge
Q7: Specialized archaeocytes that secrete large quantities of
Q8: The most complex and the most common
Q9: The structural protein found in all sponges
Q10: The modified cells of sponges that form
Q11: Flagellated canals of syconoid sponges form by
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