Role in The History of Life
History of life -4500 — – -4000 — – -3500 — – -3000 — – -2500 — – -2000 — – -1500 — – -1000 — – -500 — – 0 — Ph
a
n P
r
o
t
e
r
o
z
o
i
c A
r
c
h
e
a
n H
a
d
e
a
n ← Meteor Bombardment ends; first geochemical signs of life ← Earliest stromatolites ← ? Beginning of photosynthesis ← ? Beginning of atmospheric oxygen ← ? First eukaryotes ← ? First multicellular organisms ← Ediacaran organisms ← Cambrian substrate revolution Phanerozoic eon
Proterozoic eon
Archean eon
Hadean eon
A very brief history of life on Earth.
Axis scale is in millions of years ago. Further information: Timeline of evolution
Read more about this topic: Microbial Mat
Famous quotes containing the words role in, role, history and/or life:
“If women’s role in life is limited solely to housewife/mother, it clearly ends when she can no longer bear more children and the children she has borne leave home.”
—Betty Friedan (20th century)
“His role was as the gentle teacher, the logical, compassionate, caring and articulate teacher, who inspired you so that you wanted to please him more than life itself.”
—Carol Lawrence, U.S. singer, star of West Side Story. Conversations About Bernstein, p. 172, ed. William Westbrook Burton, Oxford University Press (1995)
“I feel as tall as you.”
—Ellis Meredith, U.S. suffragist. As quoted in History of Woman Suffrage, vol. 4, ch. 14, by Susan B. Anthony and Ida Husted Harper (1902)
“In the life of the human spirit, words are action, much more so than many of us may realize who live in countries where freedom of expression is taken for granted. The leaders of totalitarian nations understand this very well. The proof is that words are precisely the action for which dissidents in those countries are being persecuted.”
—Jimmy Carter (James Earl Carter, Jr.)