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Biology – Evolution Timeline Notes
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
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
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.