Question

I have some questions about the Geological Time scale

If you wanted to consult the Geological time scale for when the first vertebrates appeared where would you look

A. In the section for the Ordovician period of the Paleozoic era
B. In the section for the Quaternary period of the Cenozoic era
C. In the section for the Triassic Period of the Mesozoic era
D. In the section for Precambrian time

Earth Atmosphere oceans and continents started to form during the first several hundred million years of

A. Precambrian Time
B. The Paleozoic era
C. The Mesozoic era
D. The Cenozoic era

Answer 1

1st Question is A. In the section for the Ordovician period of the Paleozoic era

Answer 2

Vertebrates originated about 525 million years ago during the Cambrian explosion

Answer 3

The Cambrian explosion occurred 544 million years ago to 505 million years ago and lasted 39 million years.

Answer 4

Paleozoic Era (544 to 248 million years ago)

Answer 5

And your sure about these?

Answer 6

I know I have a book that has this kinda stuff in it .-.

Answer 7

Yea

Answer 8

Thank you!

Answer 9

Thats only for the first question though

Answer 10

Yeah the 2nd one I figured out it was Precambrian

Answer 11

Ok, medal for figuring out the second one on your own