Question

Michelle is observing a sand sample under a microscope when she finds many perforated shelled organisms. Further testing reveals that these shells are made of calcium carbonate. How should she classify these organisms?
A. They are sarcodines, belonging to phylum heliozoa of protozoa.
B. They are radiolarians, belonging to phylum ciliata of protozoa.
C. They are foraminiferans, belonging to phylum sarcodina of protozoa.

Answer 1

Answer: Option C

Explanation: The foraminiferans are hole bearing organisms that are found in the or on the seafloor sediments.

These organism contains shells on the outer body and their exoskeleton are made up of calcium carbonate that looks perforated. There are many species of foraminiferans found out of which some are found in the form of fossils and the rest are found living.

Answer 2

The answer is C, froaminiferans, since they're the only one among the three answers that have a shell. Sarcodines don't have one, nor the radiolarians, which have some kind of skeleton instead.