Question

A(n) _______ is a special kind of cell that can transform calcium carbonate into a skeleton-like structure in sponges.
A. spicule
B. collar cell
C. flagella
D. amebocyte

Answer 1

A. spicules

Answer 2

Spicules are tiny spike-like structures of diverse origin and function found in many organisms, such as the copulatory spicules of certain nematodes or the grains on the skin of some frogs. In sponges, spicules perform a structural function.