Middle School Science/Biology/Life Classification

From Wikibooks, open books for an open world
< Middle School Science‎ | Biology
Jump to: navigation, search

Life Classification

Concept[edit]

Lifeforms (organisms) are classified into groups to create a hierarchy of life.

The hierarchy of life has many divisions in it. The basic divisions are as follows:
  • Domain
    • Kingdom
      • Phylum
        • Class
          • Order
            • Family
              • Genus
                • Species

Examples[edit]

The Five Kingdoms[edit]

All life can be classified under one of five kingdoms.

Classification of Humans[edit]

Humans are living things and therefore can be classified into this hierarchy.

'Human Classification':

  • Kingdom: Animilia (animals)
    • Phylum: Chordata (animals with a vertebrate)
      • Class: Mammalia (mammals)
        • Order: Primates
          • Family: Hominidae (human-like)
            • Genus: Homo
              • Species: sapiens

Scientifically, the human species is identified as Homo sapiens.

Expository Text[edit]

Think of all the different animals that you can. Make a list of all the ones that you know about--cats, dogs, elephants, giraffes, lions, tigers, bears, bugs. Now add to the list all of the plants that you can think of--pine trees, palm trees, carrots, apples trees, lettuce, cactus, grass. Combining these will create a long list of things is hard to look at and even harder to study from. There are more than 1.5 million species of organisms that have been identified by scientists. In order to study all of these organisms, scientists have put them into different categories, in other words, they classify them.