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Biology – Evolution Timeline Notes name Overview of Evolution Earth formation _____________ Swirling ball of hot _________________ _____________________________ heavy solid nickel core Magma begins to __________________________________ _______________ begins to fall Harsh, hot, toxic, ___________________________ (no free oxygen in atmosphere) First _____________________ years First life: ________________bacteria – ______________________ ___________ need oxygen ___________ produce oxygen thrive in _______________________________ like deep ocean vents & hot caustic puddles at Yellowstone Next life: _______________________ prokaryotes _____________bacteria _______________________ – for a billion years From Prokaryotes to eukaryotes Finally: single-celled _________________________ (have nucleus and membrane-bound organelles) ___________________________ theory = photosynthesizing prokaryotes were absorbed by other bacteria to become the first organelles - ______________________ Next, soft-bodied multi-celled eukaryotes Began as ___________________ of single-celled organisms. Cells started to ____________________ and organize into multicellular organisms No backbone yet __________________ sponges, __________________ Worms Next .54 billion years (about _______________) Cambrian explosion _________________________________: rapid speciation due to new opportunities Once life organized, and the planet was a comfortable living space, evolution happened in leaps and bounds, with new species _____________________, rapidly filling every ________________ Evolution of evolutionary theory ________________________________ – living things can arise from non-living things Based on pure observation Flies come from meat Bacteria comes from broth Frogs comes from rain! ______________________ – living things come from living things Break down the term _______= life _______= birth, origin Francesco Redi 1668 Disproved spontaneous generation by setting up simple experiment to show ______________________________________________________________ Jean-Baptiste ______________ – theory of natural selection: Organisms can _________________________ through their _____________ - NOT the way it happens Charles ____________ - theory of natural selection HMS Beagle – voyage to Galapagos Islands 1830’s Helped form ideas of speciation by geographic isolation from observations of species on mainland verses different islands How did life originate? In the 1950’s, Stanley _________ and Harold __________ created an experiment to show how ______________ ____________________ could be created from the mixture of compounds present on the primitive earth.