BIOL 1F90 Lecture Notes - Lecture 20: Cambrian Explosion, Embryophyte, Gymnosperm

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Bio-: life or relating to living organisms end(o)-: within; inside. Micro-: small; too small to be seen with the naked eye. Conditions on early earth are much different than they are now. Use evidence to reconstruct what happened billions of years ago. Macro-evolutionary change: species within species, species evolving. Endosymbiosis: evolutionary theories related to how eukaryotic cells came to be (theory of origin of eukaryotic cells) Permian extinction - 250 mya (95% of life went extinct) The question cam brian ordovician silurian devonian car boniferous per mian triassic jurassic cre taceous tertiary qu aternary. Clicker q: all prokaryotes are unicellular = true. Atmosphere- early earth had a really high nitrogen content. Land masses- ancient movements, pangaea formation (supercontinent) - aquatic life in between land masses went extinct (major mass extinction) When pangaea first split it was north south, then east to west as continents move apart. Slide 14 movement of land masses over time.

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