Summary of Major Events in the Evolution of Life.

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Presentation transcript:

Summary of Major Events in the Evolution of Life

18 Billion Years Ago b BIG BANG b The universe began with the so called Big Bang, an event about billion years ago, during which all the matter in the universe was scattered in enormous explosion.

4.6 Billion Years Ago  Big Rock: Earth Forms b The first atmosphere began to form from: CO2, CO, water vapor, N2, H2S, and small traces of CH4, and NH3.  Lack of Oxygen.

3.8 Billion Years Ago b THE ORIGIN OF LIFE. b First Prokaryotic Cells Appear.

3.2 Billion Years Ago b Autotrophs. b Little change in atmosphere.

2.8 Billion Years Ago b Strong evidence of photosynthetic organisms. b Oxygen is given off into atmosphere, but still is less than 1%.

2.0 Billion Years Ago b Blue-Green Algae. b Ozone screen begins to form.

1.5 Billion Years Ago b First eukaryotic cells appear. b 2% oxygen in atmosphere.

670 Million Years Ago b Multicellular organisms. b 7% oxygen in atmosphere.

550 Million Years Ago b Shelled Animals. b Early Land Plants. b 10 % Oxygen in Atmosphere.

500 Million Years ago b Fishes. b Land plants. b Atmosphere same as today, 20% oxygen. b Complete ozone screen.

395 Million Years Ago b First amphibians.

321 Million Years Ago b First reptiles.

225 million years Ago b First flowering plants. b First birds and mammals.

Mammals

1 - 2 Million Years Ago b Human Kind - Homo sapiens.