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Unformatted text preview: about 1 Bya multicellular eukaryotes, still not too exciting, – algae. Paleozoic – Cambrian explosion , then several eons-Sea critters with shells, many body plans and shapes-Vertebrates (backbones and internal skeletons)-First land plants. Geography, cold-Insects followed by seed plants-Reptiles mammal common ancestors-Note: ca 300 Mya, mild climate, vast swamps of huge plants growing, and laying down layers for 50 – 80 MILLION years. By end of this era, movement of continents submerged these forests, pressure turned them into coal/oil/natural gas deposits. Renewable?? Mesozoic – age of Reptiles Gave rise to dinosaurs. 220 mya 65 Mya Gave rise to mammals 200 Mya Gave rise to birds 150 Mya -land plants evolving – more about these later-Pangaea breaks into today’s continents.-Ends with 10 km diameter asteroid crashing into coast of Yucatan 65 Mya Cenozoic---...
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- Fall '11
- Photosynthesis, MYA