A) Silurian
B) Cambrian
C) Ordovician
D) Precambrian
Correct Answer: D
Solution :
Trilobites represented the earliest true arthropods. They evolved during Precambrian period. Archaeozoic and Proterozoic eras are together called Precambrian because first period of Palaeozoic era is called Cambrian. In Silurian period, air-breathing terrestrial scorpions, spiders are evolved. In Ordovician, first vertebrates are appeared.
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