Which of the following statements is TRUE regarding radiolarians?
A) They possess shells composed of calcium carbonate.
B) The shells of these organisms are relatively simple, and only appear as circles.
C) The composition of their shells is unique among protists-no other protists possess shells of silica.
D) They likely evolved as a result of high sulfide levels in Earth's oceans.
E) None of the answer options is correct.
Correct Answer:
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