Refer to the table showing several prokaryote species (labeled F-J) that have been sequenced, and the genes they contain.(Note: "x" marks the species possessing a functional copy of the gene.) 
None of these species is closely related.Which two species are most likely exchanging genes? Explain your answer.
Definitions:
Variable Cost
Expenses that vary directly with the production output, including costs of raw materials and direct labor.
Selling Price
The amount of money for which a product or service is sold to customers.
Contribution Margin Ratio
A financial metric that measures how effectively a company can cover its variable costs with revenue, calculated as contribution margin divided by sales revenue.
Variable Cost Per Unit
The cost that changes in proportion to changes in the level of output or activity.
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