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18 Cards in this Set

  • Front
  • Back
Parts of Earth
Core: Liquid
Mantle: Semi-solid
Crust: Solid
Chemicals- Gases-Early atmosphere
CO2, Nitrogen, Hydrogen, Methane, Sulfur, Ammonia, H2O.
How long ago 1st cells evolved
2.75 billion years
1st cells
-Resembled prokaryotic cells.
-Lacked membrane bound organelles.
-Unicellular, tiny.
-Fermentation process (anaerobic respiration)
Heterotrophs
-Feeding an organic molecule.
-1st heterotroph are around 3 billion years ago.
-chemisynthesis.
Eukaryotic cells
-Around 2.1 billion years ago.
-Membrane bound organelles.
-Complex cells.
Photosynthesis
-Around 2 billion years ago.
-Production of 02 -> produce aerobic cell resp (produces ATP)
What type of environment are ancient bacteria found?
Heat, extreme PH, pressure, salinity.
Which kingdom contains both unicellular and multicellular organisms?
Protista
What type of plants were the first to occupy land?
Bryophytes
What is most beneficial role of bacteria?
Medicine
As heterotrophs how do fungi differ from animals?
Fungi: digest / ingest.
Animals: Ingest / digest
Species
Latin "Kind".
similar structure.
interbred naturally and produces fertile offspring.
Species Today
around 10 million (ID less than 2 million)
around 70% species found in tropics past.
around 2/3 of species were insects.
Natural selection
1. More offspring produced than he environment can support.
2. Individuals within that species must compete for limited resources.
3. Variation among individuals in a species.
4. Those with the most favorable characteristics allowing them to obtain the limited resources survived.
5. Those that survived reproduced and passed on the genes for the favorable characteristics to their offspring.
6.Genetic frequency of genes changed overtime in the species ultimately creating a new species.
Fossil
Any remnant or impression of an organism that once lived.
Unity
common among all living organisms.
speciation
evolutionary process by which biological species arise.