| (I) Found in fresh and marine water |
| (II) Microscopic plankton. |
| (Ill) Cell walls are embedded with\[CaC{{O}_{3}}.\] |
| (IV) Most of them are photo synthetic. |
A) I and III only
B) I, III and IV only
C) I, II and IV only
D) I and IV only
Correct Answer: C
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