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# Unit 5 → Geologic Time ## I. Age of the Universe, Sun, Earth * A. Universe = 13-16 billion years old = 13.6 billion years ago * B. Sun = 5 billion years old (byo) * C. Earth = 4.6 byo ## II. Order of Evolution (descent with modification) ``` "Molecules to Man" ↑ Oceans of organic material (p...

# Unit 5 → Geologic Time ## I. Age of the Universe, Sun, Earth * A. Universe = 13-16 billion years old = 13.6 billion years ago * B. Sun = 5 billion years old (byo) * C. Earth = 4.6 byo ## II. Order of Evolution (descent with modification) ``` "Molecules to Man" ↑ Oceans of organic material (primordial soup) → amino acids (No₂ ) ↓ Bacteria (3.5 bya) → 1st living thing - began synthesizing O₂ (photosynthesis) ↓ Multicellular ↓ Invertebrates (jellyfish, crustaceans, insects, slugs...) ↓ Fish ↓ Amphibians (Frogs, salamanders) ↓ Reptiles (Dinosaurs went extinct 65 million years ago) ↓ Birds ↓ Mammals ↓ Mankind (evolved 2 mya) * oldest written record = 6000 yrs or less * modern man has existed for 100,000-200,000 years ```