geological time scale

yes

geological time scale

serves as a calendar of events in earths history

eons

largest block of time billions/hundreds

era

period of time in history marked by particular events

period

division of an era made up of several epochs

epoch

smaller division of a period shorter span of geological life

mesozoic

age of reptiles

Paleozoic

ancient life

precambrian

firs life appeared longest and earliest part of earths history

cenozoic

age of mammals

HDEAN

foundation of earths core

ARCHEAN

because the organism archea already existed during that time

archea

are extremophiles they can live in extreme environment

cyarobacteria

photosynthesis

prokaryotes

single celled organism