History of Life - Big Ideas -

Organisms Change over Time Genetics Short Term Change Long Term Change Genetics Evolution

Today’s Species Arose from Earlier Species Bacteria (3.8b) eukaryotes (1b) eukaryotes  multi-cellular organisms multi-cellular organisms 

Geological Change and Evolution are Linked Tectonic plate movement distributed organisms

Earth’s Cool Dance – the Continental Drift Permian – 225 mya Triassic – 200 mya Jurassic – 135 mya Cretanceous – 65mya Present Earth’s Cool Dance – the Continental Drift

Geological Change and Evolution are Linked Living things altered the atmosphere and the earth’s surface Cyano-bacteria Oxygen formation

99.9% of all species may have become extinct “Scientists have estimated that over the course of Earth's history, anywhere between 1 and 4 billion species have existed on this planet. Be it through disease, genetic obsolescence, over-predation or any number of other factors, the overwhelming majority of these species are now extinct. Of these billions of species, roughly 50 million still survive into the modern era. While these numbers are certainly extreme at first glance, it serves as proof that extinction, while a sad occurrence, is a part of life for all living things.” Discovery channel

Rates of Evolution Vary

Mass Extinctions Occur

Evolution – abrupt or gradual