Amoeba
An amoeba was a type of  organism. 

According to Spock in 2267, the Organians were as far above Humans and Vulcans in evolution as those species were above amoeba. ()

In 2269, Spock compared the cosmic cloud seeking planets to consume with the instinct of amoeba seeking food. ()

Types of amoeba
 Andorian amoeba
 Oprelian amoeba
 Space amoeba

External link
 

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Microorganisms