Respuesta :
They are grouped based on shared characteristics. If you need the actual method used it is called taxonomy. I really hope this helps you :)
In biological classification organisms are classified on the basis of how much similarity they show between them. This phenomenon of naming and classifying living organisms is known as Taxonomy.
What is taxonomy ?
Taxonomy is the scientific study of naming, defining and classifying groups of biological organisms based on shared characteristics.
What is Biological classification ?
Biological classification is the process of arranging organisms, both living and extinct, into groups based on similar characteristics.
To know more about biological classification here
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