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Living Systems. Chapter Three: Classifying Living Things. 3.1 Types of Living Things 3.2 Dichotomous Keys. 3.1 Types of living things. Living things are classified by similar characteristics. Each different type of organism is called a species .

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Living Systems

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chapter three classifying living things
Chapter Three: Classifying Living Things
  • 3.1 Types of Living Things
  • 3.2 Dichotomous Keys
3 1 types of living things
3.1 Types of living things
  • Living thingsare classified by similar characteristics.
  • Each different type of organism is called a species.
  • It is estimated that there are over ten million different species on Earth.

All of the same kind of dust mite are members of a single species.

3 1 classifying life
One system of classification groups all living things into one of six kingdoms:




3.1 Classifying life
  • Archaebacteria
  • Eubacteria
  • Protista
3 1 classifying life1
3.1 Classifying life
  • To classify a living thing into one of the kingdoms, scientists ask 3 questions:
    • Does it have prokaryotic(simple) cells or eukaryotic(complex) cells?
    • Is it single-celled(one-celled)or multicellular (many-celled)?
    • Does it get energy by making its own food (as aproducer) or by getting food from other organisms (as aconsumer)?
3 1 two kingdoms of bacteria
3.1 Two kingdoms of bacteria
  • Bacteria are the simplest of all living things.
  • They are single-celled organisms and their cells do not have a nucleus.
  • Some bacteria can produce their own food.
  • Others break down food and absorb it.

Kingdom Archaebacteria

Kingdom Eubacteria

3 1 protists
3.1 Protists

Members of the Kingdom Protista are called protists.

Protists are an odd group of organisms because they have many different characteristics.

3 1 fungi
3.1 Fungi

Fungi are important because they break down rotting things and return the nutrients to the soil.

Kingdom Fungi includes the fungi, mushrooms, molds, and yeasts.

3 1 plants
3.1 Plants

The Kingdom Plantae is made up of multicellular organisms whose cells have a nucleus.

In photosynthesis, plants convert energy from the sun and store it in the form of molecules.

3 1 animals
3.1 Animals

Animals are multicellular organisms with cells that have a nucleus.

Beetles, worms, snakes, and birds are classified into the Kingdom Animalia.

3 1 classifying life2
3.1 Classifying life
  • Taxonomyis the process of identifying and classifying living things.
  • A Swedish scientist and explorer named Carolus Linnaeus (1707–1778) developed a system of classification in the 1700s.
  • There are currently seven levels of classification.
3 1 levels of classification
3.1 Levels of classification
  • Organisms with shared characteristics are grouped together.
  • What characteristic do these organisms share?
3 1 levels of classification1
3.1 Levels of classification
  • For animals, the levels of classification are: kingdom, phylum, class, order, family, genus, and species.
  • At what level are these two animals classified differently?
3 1 scientific names
3.1 Scientific Names
  • A scientific nameis the two-part, scientifically recognized name given to an organism, consisting of its genus and species.
3 1 scientific names1
3.1 Scientific Names
  • You may have a difficult time understanding scientific names because they are usually in Latin or Greek.
  • Felisis Latin for “cat” and domesticusis Latin for “domesticated.”