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18 Cards in this Set

  • Front
  • Back
how many species of animals are there on earth?
8.5 million
what was the first period of life and what happened during it?
archaen period (3.8-2.5 b-years ago)
life evolves
what are the plasma membrane and lipid bilayer
fats one of the organics present in the primoridal soup
frothy foam
organic matter
lipids are 2)
tend to clump together... sea foam
hydrophobic-hydrophilic ends-form distinct polymers which have orientation
most organisms were______ composed of __________ cells occasionally organized into colonies
simple; individual
cambrian explosion
increased levels of oxygen levels reach critical
530mya
the time when most of the major groups of animal first appear in the folssill... starfish, jawsless vertebrates
appearance and diversification of mineralized algae of various types, such as the coralline red algae adn the dasyclad green algae
what does calcium carbonate make up
hard exoskeletons
caco3 becomes accessible
biomineralized skeletons
evolution of hard parts
increased predation
cambrian period- no land plants at this time
molecular dating suggests that land plant ancestors diverged from the algae much earlier(700 mya)
fungi may have arouse some time about _____
1bya
armored fish became common enough to leave a rich fossill record...
tetrahedral spores- primitive land plants iinvaded the land at this time
super-continent Gondwana shifted _____
towards the south pole
what do massive glaciations do..
drained oceans exposed sea shelf
where is the boundary between the ordovician and silurian ?
about 445 million years ago
era of the dinosaurs-
evolved in the triassic and became abundant by the middle of the mesozoic
during the late mesozoic_____ most likely evolved from a group of small carnivorous dinosaurs called __________
birds; therapods
cretaceous period
plants:
what happened with flowers?
plants: conifer trees evolved at the beginning of the mesozoic
the first flowering plants evolved during the cretaceous