_______ secrete external shells of calcium carbonate, which formed much of the world's limestone, as used in the ancient pyramids of Egypt.Long pseudopods extend through pores in the shells for locomotion.
A) Foraminiferans
B) Diatoms
C) Dinoflagellates
D) Water molds
E) Radiolarians

Question

Quizplus · Accepted Answer

Foraminiferans secrete external shells of calcium carbonate and use long pseudopods for locomotion through pores in the shells. Diatoms and dinoflagellates have cell walls made of silica. Water molds are not capable of secreting shells. Radiolarians also secrete external shells of silica, rather than calcium carbonate.

_______ Secrete External Shells of Calcium Carbonate, Which Formed Much