Which one of the following options denotes the time when the majority of animal phyla first appeared in the fossil record? (MYA = Million Years Ago)
Show Hint
- 65 MYA
- 250 MYA
- 550 MYA
- 700 MYA
The Correct Option is C
Solution and Explanation
The majority of animal phyla first appeared during the Cambrian period, which is around 550 million years ago (MYA). This is known as the Cambrian explosion, a period of rapid diversification of life forms.
Step 2: Evaluating the options.
- (A) 65 MYA: This is around the time of the dinosaur extinction, not the appearance of animal phyla.
- (B) 250 MYA: This is the time of the Permian-Triassic extinction event, not the appearance of animal phyla.
- (C) 550 MYA: Correct, the Cambrian explosion occurred around this time.
- (D) 700 MYA: This is before the Cambrian period, during the Ediacaran period, but it is not the time of the appearance of most animal phyla.
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- GATE EY - 2025
- Genetics