'5 bya' diaporamas de présentation

Chapter 4

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History of Life on Earth

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Study of Life Themes & Concepts

Study of Life Themes & Concepts. Age of Earth . About 4.5 bya Life about 4 bya (Prokaryotes) Photosynthesis about 2.7 bya Organelles about 1.5 bya (Eukaryotes) About 1bya multicellular organisms. Properties of life. growth & development. reproduction. order. response. energy

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The Emergence of Complex Life

The Emergence of Complex Life.

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ASSEMBLY OF AN INFORMATION BEARING POLYMER:

ASSEMBLY OF AN INFORMATION BEARING POLYMER:. PROTEINS FIRST? Strong points: Easy to synthesize amino acids under a variety of conditions and polymers can also be formed. Even small peptides can exhibit catalytic activity. 20 amino acids provides for high information content. Weak points:

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Chemical Evolution and The First Cells

Chemical Evolution and The First Cells. Big Bang?. Earth is approx. 4.6 billion years old Formed as a result of the Big Bang which resulted in formation of universe approx. 15 bya NOTE: Currently the Big Bang theory is being challenged by physicists such as Stephen Hawkings. Early Earth.

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Overview of natural history

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