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TRANSCRIPT
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Classification
Go to Section:
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Why do we need to classify things?
1)To study how diverse life is
2)To organize everything that we see in the world.
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WHAT CLASSIFICATION USED TO LOOK LIKE…
1)It’s estimated that the earth formed around 4.6 billion years ago
- Was not possible for life to exist- Temp was too hot for water to exist in a liquid form
- Constant volcanic activity
- Atmosphere probably consisted of helium and hydrogen
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3.8 BILLION YEARS AGO…
-Evidence suggests that life came to be around this time.-What type of life?
- Single celled bacteria- Possibly cyanobacteria (blue-green algae)
- It would have been fairly easy to classify organisms at this time, because there weren’t very many life forms that existed.
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SO THEN WHAT?...-For around 3 billions years, life stayed very simple
- mostly single-celled organisms
-Life did not evolve much
-New life forms were not really developing
-Classification would have been very simple
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550 MILLION YEARS AGO…
Cambrian Explosion-Why call it the “explosion?”
-Several new types of life begin to form
- sea plants, land plants, sea animals, land animals.
-As life continues to become more complex there is a greater need to figure out what makes things different from each other.
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400-430 MILLION YEARS AGO…-Insects begin to appear…
- Scorpions, spiders, centipedes, etc…
-Plants become more complex- Forests begin to appear
-Now there is a need to distinguish how plants are different from each other
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245 MILLION YEARS AGO…
-Dinosaurs-Reptiles-Small mammals-Birds
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65 MILLION YEARS AGO…
Mammals begin to dominate life on earth
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How does classification fit into all of this?
-As time went on, life became much more complex and diverse-Because of that, it’s necessary to distinguish one life form from another
Example:- We can’t just call a dog a mammal and be done with it.
-An elephant is a mammal too.
- You have to keep getting more specific
- Like almost everything in science, there is a specific process used to do classify
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1. Why Classify?a. To study the diversity of lifeb. To organize and name organisms
2. Why give scientific names?a. Common names are misleading
Finding Order in Diversity
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jellyfish silverfish star fish
None of these animals are fish!
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Some organisms have several common names
This cat is commonly known as:
•Florida panther
•Mountain lion
•Puma
•CougarScientific name: Felis concolor
Scientific name means “coat of one color”
Why Scientists Assign Scientific Names to Organisms
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Grizzly bear Black bear Giant panda
Red fox Abert squirrel
Coral snake
Sea star
KINGDOM Animalia
PHYLUM Chordata
CLASS Mammalia
ORDER Carnivora
FAMILY Ursidae
GENUS Ursus
SPECIES Ursus arctos
Hierarchical Ordering of Classification
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As we move from the kingdom level
to the species level, more and more members are
removed.
Each level is more specific.
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Kingdom
Phylum
Class
Order
Family
Genus
SpeciesGo to Section:
Linnaeus’s System of HierarchyLeast
specific
Most specific
1. Which of the following contains all of the others?
a. Family c. Class
b. Species d. Order
2. Based on their names, you know that the baboons Papio annubis and Papio cynocephalus do not belong to the same:
a. Family c. Order
b. Genus d. Species
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Linnaeus: The Father of Modern Taxonomy
Carolus Linnaeus
1. 1732: Carolus Linnaeus developed system of classification – binomial nomenclature
a. Two name naming system
b. Gave organisms 2 names
Genus (noun) and species (adjective)
Rules for naming organisms
1. Written is Latin (unchanging)
2. Genus capitalized, species lowercase
3. Both names are italicized or underlined
EX: Homo sapiens: wise / thinking man
2. Each organism is given a scientific name – even newly discovered species
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Kingdom Archaebacteria
Cell Type Prokaryote
Number of Cells Unicellular
Nutrition Autotroph or Heterotroph
Location Extreme Environments Volcanoes, Deep Sea Vents, Yellowstone Hot Springs
Examples Methanogens Thermophiles
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Kingdom Eubacteria
E. coli
Streptococcus
Cell Type ProkaryoteNumber of Cells UnicellularNutrition Autotroph or
HeterotrophExamples Streptococcus,
Escherichia coli (E. coli)
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Kingdom Protista
Paramecium
Green algae
Amoeba
Cell Type Eukaryote
Number of Cells Most Unicellular, some multicellular
Nutrition Autotroph or Heterotroph
Examples Amoeba, Paramecium, Euglena,
The “Junk-Drawer” Kingdom
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Kingdom Plantae
Go to Section:
Ferns : seedless vascular
Sunflowers: seeds in flowers
Douglas fir: seeds in cones
Mosses growing on trees
Cell Type EukaryoteNumber of Cells MulitcellularNutrition AutotrophExamples Mosses, ferns,
conifers, flowering plants
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Kingdom Fungi
Mildew on Leaf
Mushroom
Cell Type Eukaryote
Number of Cells Most multicelluar, some unicelluar
Nutrition Heterotroph
Example Mushroom, yeast, mildew, mold
Most Fungi are DECOMPOSERS
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Kingdom Animalia
Sage grouse
Poison dart frog
Bumble bee
sponge
jellyfish
hydra
Cell Type EukaryoteNumber of Cells MulticellularNutrition HeterotrophExamples Sponges,
worms, insects, fish, mammals
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LIFE’S ADAPTATIONS:
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Symbiosis – an ongoing relationship in which two species live closely together.1. Mutualism – both benefit
2. Commensalism – one benefits and the other is neither helped or harmed.
3. Parasitism – one benefits and the other is harmed. Ex: ticks on a dog.
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Other interactions Predation-interaction where one
organism captures and feeds on another.
Competition- interaction where one or more organisms vie for the same resource.
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Interactions Predation +/- Competition -/- Symbiosis
– Mutualism +/+– Commensalism +/0– Parasitism +/-