BIO153H5 Lecture Notes - Lecture 2: Paleozoic, Mesozoic, Heterochrony

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7/1/2017

BIO 153 Lecture 2

Life’s Timeline

The Cambrian explosion

Chapter 25.1 –25.3 & 25.6

building blocks of life were made in early

atmosphere:

•Urey - Miller’s (1953) primordial

soupexperiments recreated

early earth oditios ale to

make monomers:

•made all 20 amino acids, sugars,

lipids, pyrimidines, purines

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7/1/2017

Conditions on Early Earth

•How could life have evolved?

•What role might volcanoes have played?

Life’s Tielie: The Prearia

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7/1/2017

Oxygen –where did it come from?

•Single-celled organisms with a toxic waste product!

Life’s Tielie: The Paleozoi Era

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BIO153H5 Lecture Notes - Lecture 2: Paleozoic, Mesozoic, Heterochrony

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