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