A) Mammal
B) Reptile
C) Mollusc
D) Arthropod
Correct Answer: D
Solution :
[d] Trilobites are well-known fossil group of extinct-marine arthropods that form the class Trilobite. The first appearance of trilobites in the fossil record defines the base of the Atdabanian stage of the early Cambrain period (526 million years ago), and they nourished throughout the lower palaeozoic era before beginning a drawn- out decline to extinction when, during the Devonian, all trilobite orders with the sole exception of proetids, died out.
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