An ecosystem describes the interactions between groups of organisms from all biological domains and nonliving things in a shared geographical space.

Ecosystem

In modern genetics-based taxonomy, life is categorized into three domains above the kingdom level: Archaea, Bacteria, and Eukarya. Based on the analysis of small subunit ribosomal RNA (rRNA) gene sequences, this phylogenetic model suggests all three evolved from a common ancestral cell type, but is skewed to show that Archaea and Eukarya share a closer evolutionary relationship with each other than either does to Bacteria.

Three Domains of Life

In biological taxonomy, a domain is the highest taxonomic rank widely accepted for the classification of organisms.

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From largest/most general to smallest/most specific:

- domain
- kingdom 
- phylum (in zoology) / division (in botany)	
- class 
- order
- family
- genus
- species

Main Taxonomic Ranks in Biology

Wikipedia

One or more families grouped together, distinugishes differences within a class.

Superorders and suborders are sometimes added between order and class or family, respectively.

Order (biology)

One or more orders grouped together, distinguishes differences within a phylum/division.

Class (biology)

One or more phyla/divisions grouped together, distinguishes differences within a domain .

Kingdom (biology)

One or more classes grouped together, distinguishes differences within a kingdom.

Called phylum/phyla in zoology and division(s) in botany.

Phylum/Division (biology)

A groups of species that share similarities based on common ancestry. The first part of the name used to classify an organism in the classification system made by Carolus Linnaeus

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