Which unit of geologic time is gthe shortest and most recent?

- cenozoic era

-holocence epoch

-quanternary period

-hadean epoch




when did modern humans evolve on Earth?

a. About 10,000 years ago

b. About 3. 2 mya

c. A bout 6 mya

d. About 4. 5 bya




URGET PLEASE HELP!!!!