Plz
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