Classification/Naming Species

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  • Created by: Zoeee
  • Created on: 01-05-13 18:15


We classify groups according to their characteristics

Animals with backbones are called vertebrates. The 5 vertebrate groups are:

- Fish 

They exchange oxygen and carbon dioxide across gills, lay eggs (oviparous) and fertilise externally.

- Amphibians

Exchange gases through moist, permeable skin and lay externally fertilized eggs.

-Reptiles and Birds

Exchange gases via their lungs and lay internally fertilised eggs. 

 - Mammals

Give birth to live young, which grow inside the body of the mother. Eggs are fertilised internally.

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5 Kingdoms


Multicellular. Cells lack a cell wall and chlorophyll, feed heterotrophically (food from environment)


Multicellular. Cells have chlorophyll and a cellulose cell wall. Obtain food autotrophically (food from photosynthesis)


Multicellular. Cells lack chlorophyll. Have a cell wall with no cellulose. Feed saprophytically (dead organic matter)


Unicellular, exception of seaweed. Have a distinct nucleus. 


Unicellular. Without a distinct nucleus. 

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Binomial Classification

All organisms have a 2 part name, or binomial name.This system prevents confusion over having many different names for the same species.

For examples, humans are **** sapiens

Homo is the genus name. 

Sapiens is the species name. 

Bionmial classification allows scientists to:

- Communicate information about the all the different species. 

- Recognise areas of great biodiversity that should be targets for conservation efforts. 

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What is a species?

A common definition for species is 'organisms that are capable of breeding together to produce fertile offspring.' (Fertile means it can reporduce) 

The offspring of 2 different species are known as hybrids. They are usually infertile. 

There are some complications with the definition of species because...

- Not all hybrids are sterile. For example many plant hyrbrids are fertile. 

- Not all organisms reproduce sexually. Instead they produce asexually.

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