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Understand the Classification of Living Things

Worksheet Overview

QUESTION 1 of 10

There are so many different creatures and plants on this planet, that scientists have spent years trying to organise them.

 

Group of animals


This is called classification, which is the organisation of different organisms into groups.


One of the earliest ways that scientists categorised species was designed by Carl Linnaeus in the 1700's:

 

The classification hierarchy

 

He created the Linnaean system in which living things are sorted by the characteristics that make them unique from each other, starting with kingdoms - such as the Plant Kingdom or the Animal Kingdom.

 

After that, the groups get more specific:

 

Kingdom ⇒ Phylum ⇒ Class ⇒ Order ⇒ Family ⇒ Genus ⇒ Species!

 

Here are some easy ways to remember the order:

 

Mnemonics for remembering the order of classification

 

However, over time, inventions like the microscope increased scientific understanding about structures inside organisms and how they are made to be so unique.

This meant that scientists realised they needed to start organising living things in a different way.

It seems like lots of Carls have an interest in biology, because, in the 1990's, Carl Woese classified beings using a ‘three-domain system’, which used three groups called domains as headings:

 

Archaea (primitive bacteria)

Bacteria

Eukaryote (Protists, Fungi, Plants and Animals)

 

Now let's have a go at answering some classification questions!

 

Note: Jot down any descriptions or explanations that might help you understand key concepts or be useful in your revision!

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