Relative dating
<span>Radiometric Dating
</span>http://www.ucmp.berkeley.edu/cenozoic/cenozoic.php Cenozoic era link
http://www.livescience.com/38596-mesozoic-era.html mesozoic era link
http://www.livescience.com/37584-paleozoic-era.html Paleozoic era link
http://www.nationalgeographic.com/science/prehistoric-world/precambrian-time/ Precambrian time link
Answer : Life Insurance
Explanation : Have A Good Day
◊ YusuCr ◊
Answer:
the ratios are both identical