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Domain Kingdom Phylum Class Order Family Genus Species


Scientists have discovered over a million different species of living things on Earth, but they estimate there could be as many as nine million in total. That means there are millions of species still to be discovered. All over the world, even in the most difficult and extreme environments, we find life. The life on Earth is hugely varied, from the mold growing on your food, to human beings, to mushrooms in the woods. Scientists have devised a way of classifying these organisms, not only to organize them, but also to highlight their similarities and differences. The following activities will introduce students to taxonomic rank and classification and guide them to mastery!

Student Activities for Classification Include:




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Classification & Taxonomy Background

All living things on Earth are linked with each other. Scientists believe all life as we know it has evolved from a common ancestor. This ancestor, often known by the term LUCA (last universal common ancestor), was believed to be alive around 3.5 billion years ago. Since this point, life has become varied through evolution to the wide and beautiful array of life we see all over the planet.

Nobody knows exactly how many different species exist on Earth. We have discovered just around 1.3 million species, but scientists predict that there are several million more out there that we haven’t discovered yet. New species are constantly being discovered and added to the ever-growing list. It has been a huge challenge for scientists to catalog and organized these different types of organisms. The classifying of organisms is known as taxonomy. The system most commonly used is based on the characteristics of living things and this taxonomy was first formalized by Carl von Linné (Carolus Linnæus) in the eighteenth century. The system involves sorting living things into groups and breaking those groups into multiple subgroups.

The largest groups of life are domains, of which there are three: Bacteria, Archaea, and Eurkarya. Bacteria are all around us, but are difficult to see without a microscope. Archaea are unicellular organisms that are the only life able to survive in the most extreme conditions. All the organisms in the Eukarya domain have a cellular nucleus in common, and are what we typically think of as "life".

The three domains are then be broken down into kingdoms. There are six kingdoms that all have distinct characteristics. The six kingdoms are Animals, Plants, Fungi, Protists, Bacteria, and Archaea. Bacteria and Archaea are considered both domains and kingdoms. The Eurkarya domain contains the other kingdoms: Animals, Plants, Fungi, and Protista.


Kingdoms in Taxonomic Rank

KingdomExamplesProperties
Animals
  • Tiger
  • Eagle
  • Ant
  • Multicellular and complex organisms
  • Heterotrophic - they cannot make their own food
  • Exist all over the Earth: on land, in the water, or in the air
Plants
  • Oak Tree
  • Cactus
  • Rose Bush
  • Autotrophic through photosynthesis
  • Nearly all contain chlorophyll
  • Multicellular and complex organisms
Protist
  • Malaria Parasite
  • Euglena
  • Dinoflagellate
  • mostly unicellular, some protists are multicellular
  • eukaryotic - meaning they have a cellular nucleus
  • can be autotrophic or heterotrophic
  • mostly found in water
Fungi
  • Yeast
  • Mushrooms
  • Mold
  • eukaryotic
  • most are multicellular and complex
  • heterotrophic (some are saprotrophic - they feed off dead or decaying organic matter)
Bacteria (a.k.a Eubacteria)
  • Streptococcus
  • E. coli
  • Salmonella
  • unicellular
  • can be autotrophic or heterotrophic
  • prokaryotic - meaning they lack a membrane-bound nucleus
Archaea
  • Methanopyrus
  • Haloquadratum walsbyi
  • Methanocaldococcus Jannaschii
  • unicellular
  • can survive in extreme conditions
  • prokaryotic

These kingdoms are then split up into groups known as phyla (singular: phylum). Phyla are then divided further into classes. Classes are then broken down into smaller groups known as orders. Orders are broken down into families. Within families there are subgroups known as genera (singular: genus). Finally, the genera are split into categories known as species. The definition of species is a group of organisms that can reproduce and make fertile offspring. In order to remember the order of the naming convention, can use the following mnemonic device: Keep Ponds Clean Or Fish Get Sick. Which refers to Kingdom, Phylum, Class, Order, Family, Genus and Species.

Let's look at an example of how a living thing is classified.

Classification of Humans

  • Domain: Eukarya
  • Kingdom: Animalia
  • Phylum: Chordata
  • Class: Mammalia
  • Order: Primates
  • Family: Hominidae
  • Genus: Homo
  • Species: Sapiens

This long list of names is normally shortened down to the last two names, Homo sapien, which are the genus and species, known as binomial nomenclature. A lot of the names are written in Latin as historically the first names were written in Latin by Carl von Linné. This agreed naming system allows scientists all around the world to communicate with each other. The kingdom Animalia contains all animals. Animals in the phylum Chordata all have one thing in common: a support rod up their back and in the case of humans, that means our spine. Animals in the mammalia class of which we are a part, all breath air, are warm blooded, and give birth to live young. Other animals in the class include dolphins, dogs, and bats. The order Primates contains animals such as monkeys and gorillas. Primates are categorized as having larger brains for their size than other mammals. The genus Homo contains human beings, but also a number of extinct species closely related to humans.


Essential Questions for Classification

  1. How are organisms named?
  2. How are living things classified?
  3. What defines a species?

Other Activity Ideas for Classification

  1. Create a classification flowchart for identifying animals in a particular habitat.
  2. Create a T-Chart giving examples of the different classes of invertebrates.
  3. Use a T-Chart to highlight similarities and differences between two different living things.
Image Attributions
  • Agama Lizard • puliarf • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • American Bullfrog • David Whelan • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Atlantic Bottlenose Dolphins • btrentler • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • bear • USFS Region 5 • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Bears • indywriter • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Burmese python • USFWS Headquarters • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Chinese giant salamander • toluju • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • chinese mantis / 2 • Fabio.Piscicelli • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Cod • Little Boffin (PeterEdin) • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • E. coli Bacteria • NIAID • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • euglena • schmidty4112 • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Great White Shark in South Africa • travelbagltd • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Green plant • Maria Keays • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Humans Being • simiant • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • I'm Not A Bad Looking Bear After All • Christopher.Michel • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • IMG_0250 Kenya • Ninara • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Lake Eyre Floods, South Australia • NASA Earth Observatory • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Lions having lunch • Derek Keats • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Livingstone's fruit bat • Marie Hale • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Mallard • (: Rebecca-louise :) • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Mellisuga helenae • Papchinskaya • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Oyster Mushrooms Pleurotus ostreatus • a.zhi • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Palmate newt • erikpaterson • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Panda • angela n. • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • reef1842 • NOAA Photo Library • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Saltwater Crocodile • thinboyfatter • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Snow on Snout, Polar Bear • flickrfavorites • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • SpotSpecular • Conor Lawless • License Attribution (http://creativecommons.org/licenses/by/2.0/)
  • Venusfliegenfalle (Dionaea muscipula) • blumenbiene • License Attribution (http://creativecommons.org/licenses/by/2.0/)


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