PLZ HELP ME!!!!

Which era does the rock of the Canadian Shield date back to?

a Precambrian

b Cenozoic

c Mesozoic

d Paleozoic


In what era did reptiles become dominant?



a Paleozoic



b Mesozoic



c Precambrian



d Cenozoic

What period of the Paleozoic era is known as the "age of fishes"?


Permian



Siluarian



Pennsylvanian



Devonian

What period of the Mesozoic era did dinosaurs first appear?



Jurassic



Devonian



Cretaceous



Triassic

In what era did modern man first appear?



Mesozoic



Precambrian



Paleozoic



Cenozoic