WEEK 3 - HISTORY OF LIFE PART II

History of Life

History of Life - Part II

      In week 3, I learned about systematics, taxonomy and classification of organisms. All living things are classified by characteristics into 6 kingdoms of life:

CHARACTERISTICS KINGDOMS	NUMBER OF CELL	CELL TYPE	MODE OF NUTRITION	CELL WALL
Archaebacteria	unicellular	prokaryote	autotrophic or heterotrophic	without peptidoglycan
Eubacteria	unicellular	prokaryote	autotrophic or heterotrophic or chemotrophic	with peptidoglycan
Protista	unicellular or multicellular	eukaryote	autotrophic and heterotrophic	most with cell wall
Fungi	mostly multicellular	eukaryote	heterotrophic	made of chitin
Animalia	multicellular	eukaryote	heterotrophic	absence
Plantae	multicellular	eukaryote	autotrophic	made of cellulose

Caralus Linnaeus: 

• Swedish Botanist
• first develop and publish first comprehensive and consistent classification system for plants and animal

ANALOGY VS HOMOLOGY

                              ANALOGY                                                     HOMOLOGY

          - similar function but different origin                  - similar structure and position but

          - not derived from a common ancestor                different function

                                                                                             - derived from a common ancestor