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.

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation:

wegner's theory did not explain how the continents could move

explanation: