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Living things are divided into three groups based on their genetic similarity. The three groups are:

Archaea: very ancient prokaryotic microbes.

Eubacteria: More advanced prokaryotic microbes.

Eukaryota: All life forms with eukaryotic cells including plants and animals

These three groups are called domains.

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Biology. a taxonomic category of the highest rank, grouping together all forms of life having certain fundamental characteristics in common. In the five-kingdom classification scheme adopted by many biologists, separate kingdoms are assigned to,
1)animals (Animalia)
2)plants (Plantae)
3)fungi (Fungi)
4)protozoa and eucaryotic algae (Protista)
5) bacteria and blue-green algae (Monera).

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Refers to the placement of living organisms into groups on the basis of their relationships. Modern systems of classification recognize at least five major groups of living organisms and make use of various categories to catalog the diversity within each group.

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Is a device used by biologists for identifying unknown organisms. Keys are constructed so that the user is presented with a series of choices about the characteristics of the unknown organisms; by making the correct choice at each step of the key, the user is ultimately led to the identity of a specimen.

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Is the practice and science of classification. Organisms are classified in an ordered system based on degrees of natural relatedness.

The 8 taxonomic groupings are Domain
Kingdom
Phylum (or Division for plants)
Class
Order
Family
Genus
Species.

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The theory of evolution by natural selection, first formulated in Darwin's book "On the Origin of Species" in 1859, is the process by which organisms change over time as a result of changes in heritable physical or behavioral traits. Changes that allow an organism to better adapt to its environment will help it survive and have more offspring.

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Biology. The usual major subdivision of a family or subfamily in the classification of organisms, usually consisting of more than one species.

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A system of nomenclature in which each species is given a unique name that consists of a generic and a specific term.

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Biology. The major subdivision of a genus or subgenus, regarded as the basic category of biological classification, composed of related individuals that resemble one another, are able to breed among themselves, but are not able to breed with members of another species.