Which of the following best explains the “explosion” of fossils observed during the Cambrian Period?

the first animals to have hard, preservable parts (shells and exoskeletons) evolved during the Cambrian

an extinction event destroyed nearly all fossils that existed at the end of the Vendian Period

a mass migration at the end of the Vendian Period localized species in a more concentrated area

the gradual warming of the climate during the Cambrian Period encouraged the proliferation of species

Question

Which of the following best explains the “explosion” of fossils observed during the Cambrian Period?


the first animals to have hard, preservable parts (shells and exoskeletons) evolved during the Cambrian
 
   
an extinction event destroyed nearly all fossils that existed at the end of the Vendian Period
 
   
a mass migration at the end of the Vendian Period localized species in a more concentrated area
 
   
the gradual warming of the climate during the Cambrian Period encouraged the proliferation of species

anonymous · Answer

it is the  first animals to have hard, preservable parts (shells and exoskeletons) evolved during the Cambrian