The exceptionally small cell in the image shown below is an obligate symbiont to another archaeon and a member of the genus 
Definitions:
Quantity
Quantity refers to the amount or number of a material or immaterial good or service.
Marginal Cost
The price of manufacturing one additional product or service unit.
Marginal Revenue
The increase in income from the sale of one extra unit of a good or service.
Marginal Revenue
The additional income from selling one more unit of a good; sometimes equals the price of the good.
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