HISTORY OF LIFE ON EARTH Physical conditions - last 4 billion years major changes: oxygen in atmosphere climate change ocean currents sea level changes.
Cell Communication Chapter 11 Cell Communication.
The History of Life on Earth As We Know It. The History of Earth Earth is ~ 4.5 billion years old Earth’s history is divided into four eons –Hadean Eon:
La nuova biologia.blu Le cellule e i viventi David Sadava, David M. Hillis, H. Craig Heller, May R. Berenbaum.
The Living Earth. Industrial chemicals released into the atmosphere have damaged the ozone layer in the stratosphere.
Geologic Time Tutoring Session: Lesson 3. Lesson 3 Origin and Evolution of Life.
