Answer:
2
Explanation:
The 1 & 2 are both signifigant becuase they are presented in scientific notation.
The Cenozoic era is also referred to as the Age of Mammals, or Age of Birds, because mammals and birds dominated.
=<span><span><span><span><span><span><span><span><span>148.413159d</span><span>f2</span></span>i</span>l</span><span>o4</span></span>s</span>y</span>+<span><span>a<span>l2</span></span><span>o3</span></span></span>+<span>a<span>l is the answer and have a nice day :)</span></span></span>
