Classifying LifeClassifying Life There are over 2 million known speciesThere are over 2 million known speciesof organisms.of organisms. All life is classified into 6 majorAll life is classified into 6 majorkingdoms.kingdoms.
Kingdom ArchaebacteriaKingdom Archaebacteria Bacteria live in harsh or extremeBacteria live in harsh or extremeenvironmentsenvironments UnicellularUnicellular ProkaryoticProkaryotic Heterotrophic orHeterotrophic orAutotrophicAutotrophic Cell walls withoutCell walls withoutpeptidoglycanpeptidoglycan
Most other bacteriaMost other bacteria Live everywhereLive everywhere Some cause diseaseSome cause disease Some are helpfulSome are helpful UnicellularUnicellular ProkaryoticProkaryotic Heterotrophic orHeterotrophic orAutotrophicAutotrophic Cell walls withCell walls withpeptidoglycanpeptidoglycan
Most “diverse” kingdomMost “diverse” kingdom AquaticAquatic EukaryoticEukaryotic Mostly unicellular (algae are the exception)Mostly unicellular (algae are the exception) Heterotrophic or autotrophicHeterotrophic or autotrophic Ex.) Paramecium, amoeba, euglenaEx.) Paramecium, amoeba, euglena
EukaryoticEukaryotic Multicellular (except yeast)Multicellular (except yeast) Mostly terrestrialMostly terrestrial Heterotrophic - Obtain food throughHeterotrophic - Obtain food throughabsorptionabsorption Cell walls made of chitinCell walls made of chitin
Eukaryotic and multicellularEukaryotic and multicellular Cell walls made ofCell walls made of cellulosecellulose AutotrophicAutotrophic ChloroplastsChloroplasts
Multicellular and eukaryotic Heterotrophic Digest food internally No cell walls
What do the following words have in common?What do the following words have in common? chien, inu, perro.chien, inu, perro.
In science, each species is given a “scientificIn science, each species is given a “scientificname.”name.” Ex.)Ex.) Canis familiarisCanis familiaris (scientific name for dog).(scientific name for dog). UniversalUniversal Latin.Latin. System of naming called “binomial nomenclature”System of naming called “binomial nomenclature” Carolus LinnaeusCarolus Linnaeus
Genus name (first word) - always capitalizedGenus name (first word) - always capitalized Species name (second word) - never capitalizedSpecies name (second word) - never capitalized italics or underlineditalics or underlined Ex.)Ex.) Homo sapienHomo sapien oror Homo sapienHomo sapien
Some organisms have theSome organisms have thesame genus name.same genus name. Ex.)Ex.) Felis domesticusFelis domesticusFelis leoFelis leoFelis tigrisFelis tigrisSame genusSame genusDifferent species.Different species.What is a species?What is a species?