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 the, role in, role, history and/or life:
“Always and everywhere children take an active role in the construction and acquisition of learning and understanding. To learn is a satisfying experience, but also, as the psychologist Nelson Goodman tells us, to understand is to experience desire, drama, and conquest.”
—Carolyn Edwards (20th century)
“Friends serve central functions for children that parents do not, and they play a critical role in shaping children’s social skills and their sense of identity. . . . The difference between a child with close friendships and a child who wants to make friends but is unable to can be the difference between a child who is happy and a child who is distressed in one large area of life.”
—Zick Rubin (20th century)
“My role in society, or any artist or poet’s role, is to try and express what we all feel. Not to tell people how to feel. Not as a preacher, not as a leader, but as a reflection of us all.”
—John Lennon (1940–1980)
“History ... is, indeed, little more than the register of the crimes, follies, and misfortunes of mankind.
But what experience and history teach is this—that peoples and governments have never learned anything from history, or acted on principles deduced from it.”
—Georg Wilhelm Friedrich Hegel (1770–1831)
“The feeling about a soldier is, when all is said and done, he wasn’t really going to do very much with his life anyway. The example usually is: “he wasn’t going to compose Beethoven’s Fifth.””
—Kurt Vonnegut, Jr. (b. 1922)