Which one of the following is the oldest era in Geological History determining the age of various rock types?
- A. Precambrian ✓
- B. Mesozoic
- C. Cenozoic
- D. Paleozoic
Correct Answer: A. Precambrian
Explanation
The Precambrian is the earliest part of Earth's history, set before the current Phanerozoic Eon, making it the oldest era listed.
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