Match the time frame listed on the left with the characteristic listed on the right.
a. mesozoic era
b. end of the paleozoic era
c. paleozoic era
d. end of the mesozoic era

1.tyrannosaurus rex lived.
2.the largest mass extinction happened.
3.life exploded for the first time.
4.the chicxulub crater formed.

The Precambrian is the earliest era.  It is followed by the Paleozoic, when multi-cellular life first flourished on earth  After that came the Mesozoic - 'middle life' - the era before the current one which is the Cenozoic.  Note that the Paleozoic, Mesozoic and Cenozoic are all part of the Phanerozoic Eon.

is this a psat question, if so do not cheat try your best.

we would need to see the picture to answer it