Amphistegina gibbosa is a species of protist with filose pseudopodia found near coral reefs. What cannot be true of A. gibbosa?
A. They are closely related to radiolarians.
B. They are enclosed within a shell composed of calcium carbonate.
C. They have sacs under the cell membrane.
D. They can be useful in studying global warming.
E. They are heterotrophic.
Answer: C
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