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* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
WARM UP 1. List the major eras in geologic/life history, and the years they encompass. 2. Describe why major changes in organisms occur at the end of one era of geologic time and the beginning of another. Evidence for Macroevolution The Earth • Extremely old – 4.6 billion years The Earth • Extremely old – Radiometric dating The Earth • Processes occur in the same way now that they did before The Earth – Uniformitarianism (James Hutton and Charles Lyell) Evidence 1: Fossils • Hard parts or imprints Evidence 1: Fossils • Age based on rock age or layer Evidence 1: Fossils • Show transitional forms Evidence 1: Fossils • Show transitional forms Evidence 1: Fossils • Show transitional forms Evidence 1: Fossils • Show transitional forms Evidence 1: Fossils • Show transitional forms Evidence 1: Fossils • Record is incomplete due to destruction of rock Evidence 2: Comparative Anatomy • Morphological divergence – Ancestral structure leads to many variations Evidence 2: Comparative Anatomy • Vestigial structures – Ancestral “leftovers” Evidence 2: Comparative Anatomy • Vestigial structures – Ancestral “leftovers” Evidence 2: Comparative Anatomy • Vestigial structures – Ancestral “leftovers” Evidence 2: Comparative Anatomy • Need to show homology – Similarity due to ancestry Evidence 2: Comparative Anatomy • Be careful of analogy – Similarity due to environment Evidence 3: Comparative Embryology • Look at development – Flower bud growth rate Evidence 3: Comparative Embryology – Vertebrate embryos similar Evidence 4: Comparative Biochemistry • Similarity of amino acids in common proteins and the DNA code WRAP UP • List 3 ways fossils help us understand evolution. WARM UP 1. List the 4 pieces of evidence that support evolution. 2. Give a specific example of each type of evidence. WRAP UP • Describe the piece of evidence that you think most strongly supports evolution, and explain why that is your choice.