Question

The list below shows some events which took place at different periods in the geologic time scale.

Answer 1

Answer is B) 1, 3, 2

Fish with craniums naturally preceded the evolution of sharks, since sharks have craniums. Sharks must have evolved from a cranium-wielding ancestor. 
Sharks evolved about 450 million years ago, before land vertebrates (animals with spines and skeletal systems) even existed. Mammals evolved about 100 million years later.